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PK Lab/Friday/ November 8, 2019/ 3.30 pm/ Unleashing floret fertility and grain threshability in wheat through selection of mutations favouring grain yields.
Category: Research
Posted by: bedineel

Unleashing floret fertility and grain threshability in wheat through selection of mutations favouring grain yields

Arunima Singh

Number of grains per florescence in cereals is mainly determined by floret fertility. The locus GNI1, which encodes for a homeodomain leucine zipper classI (HD -ZipI)TF, is an important contributor to floret fertility. Genetic analysis have revealed that reduced function allele GNI-A1 contributes to the increased number of fertile florets per spikelets in wheat. Another player in the wheat spike morphogenesis and grain threshability is microRNA172. It’s interaction with Q allele (confers subcompact inflorescence and free threshing grains) results in elongated spike and non-free-threshing  grains. Data shows that gene duplication generated evolutionary novelity affecting floret fertility while mutations favouring increased grain production have been under selection during wheat evolution under domestication. Grain yield could also be adversely affected by impaired photosynthesis. Hence, an efficient PSII  repair cycle is also required for maintaining a proper grain yield in any plant.

 

References:

  • Debernardi, Juan Manuel, et al. "microRNA172 plays a crucial role in wheat spike morphogenesis and grain threshability." Development 144.11 (2017): 1966-1975.

 

  • Kato, Yusuke, Kiwamu Hyodo, and Wataru Sakamoto. "The photosystem II repair cycle requires FtsH turnover through the EngA GTPase." Plant physiology 178.2 (2018): 596-611.

 

  • Sakuma, Shun, et al. "Unleashing floret fertility in wheat through the mutation of a homeobox gene." Proceedings of the National Academy of Sciences 116.11 (2019): 5182-5187.

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