Plant cell organelles secondary

If the allelochemical is hydrophylic, it cannot enter into the cell and act from outside by binding with chemoreceptors. The compounds from allelopathically active plants may serve as chemosignals and their signalling occurs via alternative pathways (i) Chemoreceptor (sensors) — transducers (G-proteins) —> secondary messengers (Ca2+, cyclic AMP or GMP, inositol triphospate, etc) —> organelles or (ii) Chemoreceptor (sensors) —> ion channels —> action potential organelles, or (iii) Chemoreceptor (sensors) —> ion channels —> cytoskeleton— organelles (Roshchina, 2005 a). What is the effect of acted allelochemical on the pathways, could be analysed to study the effects of substances on separate sites of the transduction chain. 

Early botanists referred to the obvious structural role of walls as forming little boxes around the cells. This was most apparent in the substantial thickenings of secondary walls in mature tissues. However, over the last few deeades an appreciation has developed for the complexity and multi-functional nature of cell walls. The primary wall is now regarded as a complex, dynamic organelle rather than an inert extraeellular matrix. It is now apparent that cell walls influence, and are integral to, many aspects of plant growth and development. 

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