High temperature alters the amylose content of
[www.isaaa.org] rice,
leading to mature grains with poor eating quality. Despite this, only a few
[www.isaaa.org]
genes/loci involved in this process have been studied and the mechanisms of
this process remain unclear. Hua Zhang from the Zhejiang Academy of
Agricultural Sciences, along with his team, identified the floral organ
identity gene, OsMADS7, involved in stabilizing rice amylose content at high
temperatures.

OsMADS7 was greatly induced by high temperature at the early filling stage.
Suppression of OsMADS7 stabilizes amylose content under high temperature
stress, but also results in low spikelet fertility. However, rice plants
with both stable amylose content at high temperature and normal spikelet
fertility can be obtained by specifically suppressing OsMADS7 in endosperm.

GBSSI is the major enzyme responsible for amylose biosynthesis. A low
filling rate and high expression of GBSSI were detected in OsMADS7 RNAi
plants at high temperature, which may be correlated with stabilized amylose
content in these transgenic seeds under high temperature.

Specific suppression of OsMADS7 in the endosperm could improve the stability
of rice amylose content at high temperature, and such materials may be a
valuable genetic resource for breeding rice with elite thermal resistance.

[onlinelibrary.wiley.com]



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