Grassy tillers1 promotes apical dominance in maize and responds to Shade signals in the grasses

Whipple C.J.; Kebrom T.H.; Weber A.L.Yang F.Hall D.Meeley R.Schmidt R.Doebley J.Brutnell T.P.Jackson D.P.

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Grassy tillers1 promotes apical dominance in maize and responds to Shade signals in the grasses

机译：Grassy tillers1 promotes apical dominance in maize and responds to Shade signals in the grasses

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The shape of a plant is largely determined by regulation of lateral branching. Branching architecture can vary widely in response to both genotype and environment, suggesting regulation by a complex interaction of autonomous genetic factors and external signals. Tillers, branches initiated at the base of grass plants, are suppressed in response to shade conditions. This suppression of tiller and lateral branch growth is an important trait selected by early agriculturalists during maize domestication and crop improvement. To understand how plants integrate external environmental cues with endogenous signals to control their architecture, we have begun a functional characterization of the maize mutant grassy tillers1 (gt1). We isolated the gt1 gene using positional cloning and found that it encodes a class I homeodomain leucine zipper gene that promotes lateral bud dormancy and suppresses elongation of lateral ear branches. The gt1 expression is induced by shading and is dependent on the activity of teosinte branched1 (tb1), a major domestication locus controlling tillering and lateral branching. Interestingly, like tb1, gt1 maps to a quantitative trait locus that regulates tillering and lateral branching in maize and shows evidence of selection during maize domestication. Branching and shade avoidance are both of critical agronomic importance, but little is known about how these processes are integrated. Our results indicate that gt1 mediates the reduced branching associated with the shade avoidance response in the grasses. Furthermore, selection at the gt1 locus suggests that it was involved in improving plant architecture during the domestication of maize.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2011年第33期|E506-E512|共7页
作者
Whipple C.J.; Kebrom T.H.; Weber A.L.Yang F.Hall D.Meeley R.Schmidt R.Doebley J.Brutnell T.P.Jackson D.P.;
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作者单位

Division of Biology, University of California at San Diego, San Diego, CA 92093, United States;

Pioneer Hi Bred-A DuPont Business, Johnston, IA 50130, United States;

Laboratory of Genetics, University of Wisconsin, Madison, WI 53706, United StatesBoyce Thompson Institute, Cornell University, Ithaca, NY 14853, United StatesCold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, United States;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
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Grassy tillers1 promotes apical dominance in maize and responds to Shade signals in the grasses

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