snapshot I learnt that lignin impregnates xylem cells, causing the cytoplasm to die due to the inability of water and nutrients to pass freely, hence creating hollow tubes adapted to transport materials. This means that in order for the cytoplasm to die and the tubes to be hollow, lignin needs always be present.. However lignin is not present in all xylem vessels... Lignin is the woody tissue that only forms the trunk of a tree. So how do these cells hollow out in other parts of the plant/tree to create empty transport vessels..??

  • $\begingroup$ Welcome to SE.Biology! For details on how to use this site, please check out the tour: biology.stackexchange.com/tour and then the help pages on how to ask questions on this site: biology.stackexchange.com/help/how-to-ask. Thanks! 😊 $\endgroup$ – tyersome Jul 22 '19 at 0:47
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    $\begingroup$ In particular, you have correctly deduced that what you were taught can't be completely correct. The next step is to do some research! A quick search for "protoxylem vessel formation plants" turned up this review: nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.13383 $\endgroup$ – tyersome Jul 22 '19 at 0:52
  • $\begingroup$ I did my research... of course I dont like to wait for answers on forums.. but I didnt find what answers my question. And the info I quoted is not wrong since it is from a Cambridge University book. And why do people have these forums if members constantly assume people love asking them questions instead of "doing some reaearch"?! I obviously didnt find an answer and wanted to ask a person my question. So in case you dont like the question, dont answer it, but kindly do not patronisingly guide people to research. And if u didnt read the question, my ans is still not in the source u suggested! $\endgroup$ – Isabel Jul 22 '19 at 1:17
  • $\begingroup$ Your question is much better now! I'm sorry you felt patronized by my comments, but if you stick around (please do) you will see that many questions are posted by people who clearly haven't made even a minimal attempt at working out an answer. Since there was no indication in your original post that you had tried to do any research I assumed that was likely to be true in your case as well. I guess that whoever voted your question down felt the same way ... $\endgroup$ – tyersome Jul 22 '19 at 3:36
  • $\begingroup$ Based on the passage you highlighted I think you are misinterpreting what is written — it does not say lignification is necessary only that it is sufficient. I had another look at the article I suggested and from the summary "We also summarize the processes which have been shown to be instrumental during xylem maturation. This includes mechanisms of cell wall formation and cell death which collectively complete xylem cell fate." — I don't have time right now to read through the whole article, but that sounds directly relevant to your question to me ... $\endgroup$ – tyersome Jul 22 '19 at 3:41

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