科研团队破解水稻感知并响应高温的“双重密码”

Core Insights - A significant breakthrough in understanding how rice perceives and responds to high temperatures has been published in the journal "Cell," revealing a dual signaling mechanism that can enhance crop heat tolerance [1][2][3] Group 1: Research Findings - The research identifies two key regulatory factors in rice: DGK7 (diacylglycerol kinase) and MdPDE1 (phosphodiesterase), which work together to convert high-temperature physical signals into biological instructions within the cell [1][2] - The first layer of the signaling mechanism involves the activation of DGK7 on the cell membrane, which generates lipid messengers that amplify the heat signal [2] - The second layer involves MdPDE1 in the nucleus, which maintains the expression of heat tolerance genes by degrading cAMP, leading to the synthesis of heat shock proteins and reactive oxygen scavengers [2] Group 2: Agricultural Implications - The discovery provides precise targets for breeding, allowing for the genetic design of rice varieties with gradient heat tolerance, which can adapt to varying climatic conditions [3] - Field trials showed that single-gene modified rice lines increased yield by 50% to 60%, while double-gene modified lines achieved nearly double the yield compared to control lines, with improved grain quality [2] - This research offers theoretical foundations and genetic resources for heat tolerance breeding in staple crops like rice, wheat, and corn, addressing food security challenges posed by global warming [3]