By James V. Anderson
Plant dormancy contains synchronization of environmental cues with developmental procedures to make sure plant survival; besides the fact that, unfavorable affects of plant dormancy contain pre-harvest sprouting, non-uniform germination of crop and weed seeds, and fruit loss because of irrelevant bud holiday. therefore, our persevered quest to disseminate info is necessary in relocating our realizing of plant dormancy ahead and to advance new rules for bettering nutrients, feed, and fiber construction and effective weed regulate, fairly less than international weather switch. continuing from the fifth overseas Plant Dormancy Symposium will supply an outline comparable on our present realizing of the way environmental components effect mobile, molecular, and physiological methods considering bud and seed dormancy, and views and/or studies on achievements, which may still stimulate new rules and features of research that bring up our figuring out of plant dormancy and spotlight instructions for destiny examine.
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Extra info for Advances in Plant Dormancy
Germination of seeds of a strigolactone biosynthetic mutant ( max1-1) and a signaling mutant ( max2-1) were 3 °C more sensitive to elevated temperature than were wild-type seeds. Exogenous GR24 can rescue seeds of max1-1 but not of max2-1, indicating that strigolactone action has a promotive effect on seed germination at high temperature (Toh et al. 2012). Alleviation of thermoinhibition by GR24 was 20 H. Huo and K. J. Bradford blocked by the GA inhibitor PAC, suggesting that GA is required for the action of strigolactones on germination; in addition, GR24 can increase the endogenous GA4 content of seeds.
However, how these genes are regulated by temperature is not fully understood. Further studies are needed on the cellular mechanisms and molecular components that perceive temperature during seed imbibition and mediate the expression of NCED9-like genes (Franklin and Wigge 2014; Penfield 2008; Wigge 2013). Other hormones, particularly GA and ethylene, can at least partially alleviate thermoinhibition, but direct connections among ABA, temperature and these pathways are not fully characterized. Expression of GA- and ethylene-related genes is in general oppositely regulated in comparison with ABA-related genes during seed imbibition, but whether this is in response to changes in ABA levels or action or to independent temperature sensitivity mechanisms remains to be definitively determined.
2011; Footitt et al. 2014). Here we will consider the seeds response to temperature as a temporal signal and both light and nitrate as spatial signals. The underlying sensing and resulting signaling mechanisms to the environment make seeds highly efficient in exploiting distinct habitats and climate spaces (Pons 2 Regulation of Seed Dormancy Cycling in Seasonal Field Environments 37 1989; Saatkamp et al. 2011a, b; Walck et al. 2011). However, the precise response to any environmental signal differs between species, and between ecotypes within species, through adaptation to the habitat and climate space they inhabit.