Managing flowering time in Miscanthus and sugarcane to facilitate intra- and intergeneric crosses

作者：Hongxu Dong, Lindsay V. Clark, Xiaoli Jin, Kossonou Guillaume Anzoua, Л. В. Багмет, Pavel Chebukin, Elena Dzyubenko, Nicolay Dzyubenko, Bimal Kumar Ghimire, Kweon Heo, Douglas A. Johnson, Hironori Nagano, Andrey Sabitov, Junhua Peng, Toshihiko Yamada, Ji Hye Yoo, Chang Yeon Yu, Hua Zhao, Stephen P. Long, Erik J. Sacks · 发表于：PLoS ONE · 年份：2021 · DOI：10.1371/journal.pone.0240390 · 被引用次数：18 · 研究领域：Sugarcane Cultivation and Processing、Bioenergy crop production and management、Biofuel production and bioconversion

Miscanthus is a close relative of Saccharum and a potentially valuable genetic resource for improving sugarcane. Differences in flowering time within and between Miscanthus and Saccharum hinders intra- and interspecific hybridizations. A series of greenhouse experiments were conducted over three years to determine how to synchronize flowering time of Saccharum and Miscanthus genotypes. We found that day length was an important factor influencing when Miscanthus and Saccharum flowered. Sugarcane could be induced to flower in a central Illinois greenhouse using supplemental lighting to reduce the rate at which days shortened during the autumn and winter to 1 min d-1, which allowed us to synchronize the flowering of some sugarcane genotypes with Miscanthus genotypes primarily from low latitudes. In a complementary growth chamber experiment, we evaluated 33 Miscanthus genotypes, including 28 M. sinensis, 2 M. floridulus, and 3 M. ×giganteus collected from 20.9° S to 44.9° N for response to three day lengths (10 h, 12.5 h, and 15 h). High latitude-adapted M. sinensis flowered mainly under 15 h days, but unexpectedly, short days resulted in short, stocky plants that did not flower; in some cases, flag leaves developed under short days but heading did not occur. In contrast, for M. sinensis and M. floridulus from low latitudes, shorter day lengths typically resulted in earlier flowering, and for some low latitude genotypes, 15 h days resulted in no flowering. However, the highest ra...