The study of plant life; e.g. angiosperms, gymnosperms, bryophytes, pteridophytes, and algae.

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239 views

What bacteria shed harvestable energy from root zone organic matter?

I recently heard of a successful effort that harvests energy from soil at plants' bases due to apparently bacterial breakdown of wastes from the plants: Via photosynthesis a plant produces organic ...
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37 views

What type of tree is this?

I photographed this group of trees a couple of years ago at the northern tip of Prudence Island in Narragansett Bay. Any idea what species these are?
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72 views

How does a garlic clove thrive inside a closed refrigerator?

A garlic clove has been growing very well inside a closed refrigerator. It has developed beautiful green stalks, which I think are the equivalent of leafs. Since they are green, I assume they ...
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20 views

Why do shed and brown poplar (Populus) leaves get an iridescent blueish colour when wet?

When the brown leaves of poplars shed on the ground stay for a while under wet conditions (e.g. like in a puddle), they become a fascinating iridescent blueish colour, which is best seen when light ...
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116 views

Mating types in fungi (and somatogamy)

I would have some related questions about the mating types of fungi. Does a single spore generate a mycelium possessing only one mating type? If it does not in general, do Ascomycota and ...
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68 views

Behavior of plant guard cells: open or closed stomata

On an exam of mine, I had the following question: The interaction between the guard cells and stomata in a plant leaf can be seen in the diagram below. In which scenario could the guard ...
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38 views

Does the bending of a tree's trunk in the wind stimulate and strengthen root growth?

Recently Southern California experienced extreme wind velocities and afterwards the news reported over 300 trees had fallen in San Diego County. I had either heard or read somewhere that the action of ...
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60 views

What is the advantage of using plant-derived antibacterials rather than bacteria-derived antibacterials?

So obviously we have a big problem with antibiotic resistance. Most of our antibiotics originate from bacteria themselves (or are synthetic variations on scaffolds which originate from bacteria). I ...
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51 views

Aloe species identification

I am trying to find out which species these are. Someone claimed they were Aloe Vera, but I am skeptical as I have never seen Aloe Vera with that kind of growth. These look more like Aloe Juvenna to ...
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56 views

What is the name of this plant, from Bangladesh?

This is a small plant from my backyard. I have found the flower closes in the evening.
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21 views

What techniques can be used to link environmental conditions to crop yield?

Im interested in how we can determine what are the optimal conditions for crops and how deviations from these optimal conditions affect yield. In the literature I have found two main approaches and I ...
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39 views

Do ginko trees grow well in Eastern North America (specifically Ontario,Canada)

I have recently noticed many Ginko (Ginko biloba) saplings planted in my Eastern Ontario city (in Canada), and they are looking a bit sickly, with yellow leaves. They seem to be a popular choice in ...
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106 views

Cause-and-effect questions about growth and development of plant

I need to solve some cause-and-effect problems. The problems are related to growth and development of plant. "Growth and Development" chapter is the first chapter in third level of high school (senior ...
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58 views

What Chemical Trigger Causes Ectomycorrhiza To Change From Asexual To Sexual?

I want to know the trigger behind the change of asexual to sexual ectomycorrhiza when symbiosis with a tree root is formed. As ectomycorrhiza attaches itself to a root, it forms a relationship wherein ...
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43 views

Expected reproduction rate of a dandelion and/or fern

I am working a basic mathematical/computer simulation of an ecosystem, and I need to know the birth rate of each organism in my simulation. However, I could not find any data for how often a small, ...
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139 views

Pits and Pores in Vascular Tissue

What purpose is served by the pits and pores in xylem and phloem cells? I cant find what purpose that these components serve in the vascular tissues in plants
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94 views

Is the number of stamens always 9 for geranium?

We are studing in class the reproduction of plants. We start the lesson by observing some components of flowers, it was the Géranium. First of all we start counting the number of sepals , petals and ...
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55 views

How many cells are there in the apical meristematic tissue?

How many cells are there in the apical meristematic tissue? Looking at this picture... , I would tend to think that there are few hundreds cells in the meristem tissue. But I guess this is a ...
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132 views

Why are watermelons sweeter in the center?

Today I had a slice of watermelon and when I reached the outer parts of the pulp I wondered why those are less sweet. Whether or not the sugar occurs in crystalline form in watermelons is still an ...
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150 views

What metabolic processes do dormant and ungerminated seeds carry out?

What metabolic processes does a dormant embryo in a seed carry out? Seeds will not germinate, either because of a lack of favourable conditions, seed hibernation, or because of a genetically ...
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54 views

Why is this dry pepper fruit still “powered”?

Check out this photo of my pepper plant this cloudy morning: (click for full res) Usually (and this can be seen on 2 and a half of the 4 fruits in this pic) the fruits are "disconnected" from the ...
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140 views

Green feather-like formations in tap water - what is it? (with pictures)

These things recently appeared in my tap water Copenhagen Denmark, this summer 2013. They are very small, and have a feather like structure. I've called the water supply, and they thought that it was ...
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81 views

Are mature trees as susceptible to mutation from exposure to radiation as seedlings?

If a plant, say a ficus or a teak, as a sapling were exposed to radiation, and a tree of the same species were present at the same distance, which of the two would be more likely to mutate?
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34 views

Do trees have genes for stopping the grow?

Do trees have genetically encoded to stop growing at some height, to keep dividing the cells only to a certain amount, or to pump nutritions only till it's advantageous because they've already ...
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16 views

Have there been any studies on 'surf balls'? (not related to surfing)

I know the title sounds like something else, but I'm actually wondering about these things, which are also apparently called 'whale burps': This one was found on a beach on Lake Michigan. Does ...
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28 views

height and bryophytes

Why does being taller provide advantages for Bryophyta but being shorter is better for Marchantiophyta? What disadvantages could being taller have? I think that by being taller, you have ...
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66 views

Is there a plant particularly suitable for absorbing Hydrogen Sulfide

I live in an area with some open sewers and in the morning I can usually can smell the gas inside my house. There are many plants like snake plant which improve indoor air quality but I was ...
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40 views

What is the highest pressure at which plants can survive?

Inspired by this awesome question, I'm looking for the corresponding maximum: what is the highest air pressure at which plant life can survive? For example, Venus's atmosphere is about 90x as dense ...
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23 views

Which biosynthetic pathways take place in the plastid and were are they located?

I know that the isoprenoid, jasmonate, glucosinolate, fatty acids, chlorophyll, starch, and aromatic amino acid syntheses are located in the plastid. But I don't know if they are located in the ...
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49 views

Rosemary room temperature at winter

I consistently read in non-scientific resources that I have to put my rosemary to low temperature (about 10°C) in winter (unless I don't want it to freeze). I googled, but I fail to find a scientific ...
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50 views

What should be the distance between plant promoter and gene?

I am trying to clone a rice gene under a different endogenous rice promoter.I will be cloning the CDS of the rice gene.So I wanted to know what is the minimum or maximum distance I should put between ...
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41 views

Genetically improved *Leucaena leucocephala* seeds

I am looking for fast growing Leucaena leucocephala seeds. Now, I am cultivating Leucaena leucocephala which can grow 6 meters in a year. But I am looking for a genetically improved seed which can ...
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31 views

Is there a database of pollen-seed distances across plant species?

I was enjoying Richard Smith's excellent answer to this question, and wondered: If you consider the pollen/seed distribution range to be plant locomotion, is there a database that compares these ...
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16 views

Banana cultivar identification

I found a cultivar of banana that I haven't seen before (and that was significantly different from the standard Cavendish cultivar) in a market in Hong Kong today, due to the language barrier ...
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17 views

Moss Transportation System

In my biology textbook, it says that mosses are avasculer and do not have xylem like spermatophytes. So by what means do mosses transport nutrients ?
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15 views

Can plant roots absorb dissolved oxygen from water, or do they require actual bubbles in the water?

Plant roots generally require some exposure to air. Deep water culture is a form of hydroponics where plants' roots are left to soak in water. To keep the roots from "suffocating", most online ...
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32 views

Is there a way to identify a species of tree?

My family has been passing down seeds from a lemon tree for about 3 generations now, There is some controversy about its origin or species. The lemons look like tangerines and when cut the pulp is ...
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10 views

Phototropism or Hydrotropism is a more important factor for trees beside the lakes growing bending to the water?

I see a lot trees beside the lakes are growing bending to the water and I wonder why. After reading this I think it might be a combined effects by: Phototropism: the lake works as a mirror and ...
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19 views

Do any plants grow leaves beneath the ground?

We have a pretty common California weed in our yard. When we dig in the ground, we often find small ones there, with green leaves! It's as if they form green leaves before they come to the surface. ...
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27 views

Why does my corn appear to have perfect flowers?

Corn is said to be a synchronously monoecious plant with separate male and female flowers. I am growing a cross between a Peruvian and heirloom variety which seems to be growing some perfect flowers ...
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19 views

How does the snail shells' fertilizer compare to regular fertilizers?

May I ask about the quality of the fertilizer derived from the shells and their effectiveness compared to other fertilizers on the market ?
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21 views

Relation b/w venation and transpiration

What purpose does reticulate venation in dorsiventral leaf or parallel venation in isobilateral leaf serve? Does it have any relation with unequal transpiration in dorsiventral leaf or equal ...
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14 views

In what sense does lichen 'eat around itself'?

Source: pp 31-32, Lichen Secondary Metabolites: Bioactive Properties and Pharmaceutical Potential, edited by Branislav Ranković Lichens are used for many different medicinal purposes, but there ...
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29 views

Is there a special reason why ferns are so early in evolution?

Reading about plants in history it seems that ferns where already in the Devonian period (400 million years ago) growing. Probably the climate in that time was very different from now, but what made ...
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19 views

Machine-readable APG III trees?

Does anyone know where I can find a machine-readable version of the phylogenetic trees from APG III? I'm looking for something that contains the full tree structure, including unnamed branches. ...
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38 views

“Signal Advance”: Unsure of meaning or contextual use

I am reading through Recombinant DNA; Genes and Genomes - A Short Course - Third Edition by James D. Watson, et. al. and I came across this paragraph in the discussion about discrete factors of ...
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19 views

Yew seed dormancy reduction

Yew seeds have very long dormancy when artificially planted. They are also adapted to passage through digestive systems of animals that eat/transport them. But could the dormancy be shorter (or the ...
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16 views

Pepper plant leaf curl and “sweating”

The "sweating" and leaf curl have been going on for about a week. I've done some extensive googling and have found mixed diagnoses. For context, the ambient temperature is 74°, I'm using 6,500 K lamps ...
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12 views

Why guard cells need to turn malate into postassium malate to become turgid?

According to the Active Potassium Transport Ion concept given by Levitt et.al, stomata open due to turgidity in guard cells. It seems that guard cells turn the starch produced by photosynthesis into ...
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13 views

Why do chlorotic leaves have green veins?

If chlorotic leaves are chlorophyll deficient, why should the veins be green? shouldn't all the available chlorophyll be directed to the leaf lamina?