【摘要】 通过盆栽试验研究干旱胁迫对不同花椒品种(美凤椒、小红冠和狮子头)根系生长及其水分利用效率的影响。结果表明:干旱条件下,花椒的主根伸长生长受到抑制,侧根伸长生长则被促进,直径0~2和≥2 mm的侧根数量显著减少,地上部分和根系生物量降低;5—9月份,在轻度、中度和重度干旱胁迫下,美凤椒的主根长度分别较对照减小10.4%,24.7%和44.0%,小红冠的主根长度分别较对照减小10.1%,28.4%和35.8%,狮子头的主根长度分别较对照减小8.4%,27.9%和42.9%;在重度干旱胁迫条件下,美凤椒、小红冠和狮子头的蒸腾耗水量分别较对照降低65.5%,51.8%和66.7%,水分利用效率分别提高12.2%,26.3%和33.1%。3个品种中,小红冠对干旱的适应性最强,其次是美凤椒,狮子头最弱。更多还原

【Abstract】 A pot culture experiment was carried out to examine the effects of drought stress on the root growth and water use efficiency( WUE) of three cultivars of Zanthoxylum bungeanum: Meifengjiao( M),Xiaohongguan( X),and Shizitou( S). The results showed that the elongation growth of the main roots of the three cultivars was inhibited,while that of the lateral roots was enhanced. The number of lateral roots with the diameters of 0 to 2 mm and ≥ 2 mm significantly decreased. Both aerial and root biomass decreased. Under mild,moderate,and severe stress conditions,the main root length of cultivar M decreased by 10. 4%,24. 7%,and 44. 0%,by 10. 1%,28. 4%,and 35. 8% for cultivar X,and by 8. 4%,27. 9%,and 42. 9% for cultivar S from May to September,compared to that of control. Under severe drought stress,the transpiration water consumption of cultivar M,X,and S decreased by 65. 5%,51. 8% and 66. 7%, respectively,while WUE increased by 12. 2%,26. 3%,and 33. 1%,respectively,compared to that of control. It was concluded that under drought stress,the morphological characteristics and tolerant capabilities to drought were different among different cultivars. Cultivar X exhibited the highest drought tolerance,followed by cultivar M,and then cultivar S.更多还原