关键词: 粮食安全, 粮食安全, 空间诱变育种, 搭载, 选育, 新品种, 推广

Abstract:

Maize species called as ‘Danyu39’ was selected in the pot experiment. The effects of soil water contents under 6 treatment of different water supply (soil water contents reach 35%, 45%，55%, 65%, 75% and 85% of holard) on the growth of roots and leaves of spring maize were analyzed, in order to determine the quantitative assessment indices of water stress during seedling in Liaoning Province. The results indicated that: plant height, stem diameter and leaf area of spring maize were great under 75% and 85% of holard. The growth of spring maize was restrained under water stress (35%, 45%，55% of holard). For example, plant height, stem diameter, aboveground and belowground biomass and leaf area all decline, while root/shoot ratio increased. The proper drought (55% of holard) was favorable to the growth of roots, and root/shoot ratio could be increased. The effects of water stress on plant height and growth of roots of spring maize was significant, and its effect on aboveground biomass was larger than on belowground biomass.