Can Plants Normally Produce Seeds under Microgravity in Space?

Japanese Journal of Crop Science

Hiroshi SUGE¹  Ismail TURKAN¹ 

关键词: Barley;    オオムギ;    Gravity response;    種子生産;    Microgravity;    種子稔性;    Mutant;    重力反応;    Seed production;    突然変異;    Seed fertility;    微小重力;   

DOI  :  10.1626/jcs.60.427

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Growth analysis was performed on a barley (Hordeum vulgare L.) mutant line showing an abnormal gravity response, and also on the original normal line. The reproductive structures of mutant plants were quite different from the original normal plants. Analysis by stratified clip method revealed difference in distribution of leaves, stems, and heads, as well as leaf area index (LAI) in the mutant line caused by diagravitropic or plagiogravitropic growth. Mutant plants showed an abnormal gravity response even in the seedling stage. In mutant but not normal plants, the direction of first-leaf growth depended on the position of the embryo. Seed production of mutant plants was about 60% compared with normal plants, even though net assimilation rate (NAR) and relative growth rate (RGR) were not decreased. Seed fertility of mutant plants was correlated with the angle between heads and ground level. However, when plants were turned upside down, all heads, both mutants and normal, were nearly vertical, and seed fertility recovered to a level that not significantly different from normal plants. From these results, it was predicted that barley plants may not produce seeds normally under microgravity.

【 授权许可】

Unknown