Auxin Transport In Plants The term auxin is derived from the greek word auxein, which means "to grow." while many synthetic auxins are used as herbicides, indole 3 acetic acid ( iaa) is the only naturally occurring auxin that shows physiological activity (figure 4.4.1.1 ). auxin is synthesized in apical meristems, young leaves, and developing seeds. This page titled 16.5b: auxin is shared under a cc by 3.0 license and was authored, remixed, and or curated by john w. kimball via source content that was edited to the style and standards of the libretexts platform. auxins are plant hormones. the most important auxin produced by plants is indole 3 acetic acid (iaa).
Auxin вђ Definition Structure And Function Among all the known auxin transporter families, the pin algal homologs are so far the only ones to have been tested experimentally. using auxin transport assays in tobacco by 2 cells heterologously expressing klebsormidium flaccidum kfpin, it has been recently shown that this protein is indeed a functional auxin carrier (skokan et al., 2019). Permissiveness. in biology, permissiveness is a certain relationship between hormones and the target cell. it can be used to describe situations in which the presence of one hormone, at a certain concentration, is required to allow a second hormone to fully affect the target cell. for example, thyroid hormones increase the number of receptors. Figure 11.1.4 11.1. 4: the polar transport of auxin. auxin (iaah) enters the cell through influx transporters (orange) or passes directly through the plasma membrane (not shown). in the cytoplasm (ph = 7), which has a higher ph than the apoplast (ph = 5), auxin dissociates to release a proton (h ) and anion (iaa ). A tropism is directional growth in response to a stimulus. a positive tropism occurs when a plant (or a part of the plant) grows towards the stimulus, and a negative tropism is growth away from the stimulus. phototropism is directional growth in response to light (figure 4.2.1.1 4.2.1. 1 ).
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