skip to primary navigationskip to content
 

'Ethylene-gibberellin signalling underlies adaptation of rice to periodic flooding' (Science, Vol. 361, Issue 6398, pp. 181-186)

last modified Jul 27, 2018 02:36 PM
Deepwater rice varieties grow taller when flooded, in a growth response driven by the plant hormones gibberellin and ethylene, to keep the leaves above the water. Kuroha et al. identified the genes underlying this phenotype.

Most plants do poorly when flooded. Certain rice varieties, known as deepwater rice, survive periodic flooding and consequent oxygen deficiency by activating internode growth of stems to keep above the water. Here, the authors identify the gibberellin biosynthesis gene, SD1(SEMIDWARF1), whose loss-of-function allele catapulted the rice Green Revolution, as being responsible for submergence-induced internode elongation.

As contemporary climate change triggers radical shifts in weather patterns, cryptic genetic variation found in wild rice gene pools may offer adaptive solutions to help breeders fine-tune modern rice varieties.

A transcriptional gain-of-function allele of the Green Revolution semidwarf gene triggers rapid stem elongation in deepwater rice, enabling it to survive adverse flooding conditions. Thus, the same gene has been co-opted several times to permit rice cultivation in highly contrasting production systems via different molecular responses—decreasing enzymatic activity in one case and enhancing transactivation in the other. The capacity of SD1 to function in such diverse roles in cultivated rice highlights the intrinsic complexity and molecular plasticity of plant adaptation strategies.

 

The full article by Kuroha et al. can be accessed on the Science website.

 

Cambridge Global Challenges is a Strategic Research Initiative of the University of Cambridge that aims to enhance the contribution of its research towards addressing global challenges and achieving the Sustainable Development Goals (SDGs) by 2030.

SDGs

Find out about open funding opportunities, pre-call announcements, responsive calls, studentships and awards relevant to the global challenges agenda.

Read more