干旱胁迫下菊芋各器官生物量及物质分配规律

以红皮和白皮菊芋为研究材料,通过设置不同的灌水梯度,研究了干旱胁迫对菊芋各器官生物量及物质分配规律的影响。试验结果表明,干旱胁迫降低了红皮和白皮菊芋各器官的生物量;其中,50%灌水条件下两种菊芋的总生物量、地上生物量和地下生物量显著高于10%、20%、30%和40%;红皮菊芋根冠比随着灌水量的减少呈现逐渐增加的变化趋势,白皮菊芋呈现"升-降-升"的变化趋势,且在相同水分处理条件下红皮菊芋茎叶比和根冠比均高于白皮;红皮菊芋随着灌水量的降低根系贡献率呈现逐渐增加的变化趋势,叶片贡献率、块茎贡献率、花贡献率、叶柄贡献率、茎秆贡献率均呈现逐渐降低的变化趋势,白皮菊芋块茎贡献率、花贡献率随灌水量的降低呈现逐渐降低的变化趋势,其他各器官的贡献率随灌水量降低没有规律可循。

Organ biomass and resource allocation in response to drought stress in Jerusalem artichoke

This study aimed to study the effects of drought on biomass and its distribution in a crop of Jerusalem artichoke (JA) under different irrigation gradients and to provide a reference for cultivation and management of the crop in arid area. Drought decreased the organ biomass of both red skin JA and white skin JA. The total biomass, aboveground biomass, and underground biomass under 50% irrigation were significantly greater than those under 10%, 20%, 30%, and 40% irrigation, respectively. The root/shoot ratio of the red skin variety showed a increase tendency with decreases in the irrigation levels, while the white skin variety showed an "up-down-up" pattern. For red skin JA, the root contribution to biomass increased gradually with decreases in irrigation levels, indicating a gradual reduction in leaf, tuber, stem, and petiole contributions. For white skin JA, the contributions of tuber and flower decreased gradually with decreases in irrigation levels, while the contributions of other organs did not display a regular pattern upon changes in irrigation.