17.高温ストレスによるオーキシンの減少が雄性不稔を誘発する(口頭発表)

概要

論文の詳細を見る
Plant high-temperature (HT) injury has become a serious problem associated with global warming. The early phase of anther development is especially susceptible to HT injury in wheat, barley and other crops. Here, we have found that HT conditions showed a high correlation coefficiency with transcriptional repression of replication-related and auxin-induced genes. The application of auxin to barley completely reversed HT-induced male sterility. Similar reductions in auxin levels and reversibility by exogenous auxin application occurred in the developing anther cells of HT exposed Arabidopsis. In addition, YUC2 and -6 gene transcripts decreased by HT treatment in developing anther. These data suggest that tissue-specific auxin reduction causes comprehensive transcriptional inhibition including anther specific auxin biosynthesis genes. It is a primary cause of HT injury, which leads to the abortion of pollen development, and moreover suggests a novel use for auxin treatment to sustain steady yields of crops under conditions of climate change.
2009-10-06