首页|The TaGW2-TaSPL14 module regulates the trade-off between tiller number and grain weight in wheat
The TaGW2-TaSPL14 module regulates the trade-off between tiller number and grain weight in wheat
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IDEAL PLANT ARCHITECTURE1(IPA1)is a pivotal gene controlling plant architecture and grain yield.However,little is known about the effects of Triticum aestivum SQUAMOSA PROMOTER-BINDING-LIKE 14(TaSPL14),an IPA1 ortholog in wheat,on balancing yield traits and its regulatory mechanism in wheat(T.aestivum L.).Here,we determined that the T.aestivum GRAIN WIDTH2(TaGW2)-TaSPL14 module influences the balance between tiller number and grain weight in wheat.Overexpression of TaSPL14 resulted in a reduced tiller number and increased grain weight,whereas its knockout had the opposite effect,indicating that TaSPL14 negatively regulates tillering while positively regulating grain weight.We further identified TaGW2 as a novel interacting protein of TaSPL14 and confirmed its ability to mediate the ubiquitination and degradation of TaSPL14.Based on our genetic evidence,TaGW2 acts as a positive regulator of tiller number,in addition to its known role as a negative regulator of grain weight,which is opposite to TaSPL14.Moreover,combinations of TaSPL14-7A and TaGW2-6A haplotypes exhibit significantly additive effects on tiller number and grain weight in wheat breeding.Our findings pro-vide insight into how the TaGW2-TaSPL14 module regulates the trade-off between tiller number and grain weight and its potential application in improving wheat yield.
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