4份菊苣种质材料苗期抗旱性评价

Drought resistance evaluation of four seedling chicory

采取温室盆栽干旱胁迫方法,研究不同程度干旱胁迫对4份菊苣材料苗期11种抗旱性指标的影响。结果表明,随着干旱胁迫程度加重,菊苣叶片含水量及相对含水量、株高、生物量降低,叶片相对电导率、可溶性糖含量、游离脯氨酸、根冠比变化趋势比较明显,株高胁迫指数与干物质胁迫指数变化不大;综合分析认为叶片含水量、相对含水量、株高、根冠比、细胞膜透性、可溶性糖含量可以作为菊苣抗旱性评价的主要指标,地上生物量、地下生物量、株高胁迫指数、干物质胁迫指数、脯氨酸仅可作为菊苣抗旱性评价的参考指标。通过对11种抗旱性指标进行隶属函数法综合评价,得出4份菊苣材料抗旱性由强到弱的顺序为:C2>C1>C4>C3,该结果与田间观测结果相一致。

The effects of drought stresses on eleven drought-resistant characteristics of four seedling chicory were studied by reducing soil water in a pot experiment. The leaf water content （LWC）, leaf relative water content （LRWC）, height and biomass of the four seedling chicory decreased, while their leaf soluble sugar con- tent （LSSC）, leaf relative electrical conductivity （LREC）, proline and root/shoot increased with improved drought stress resistance. Drought stress did not significantly affect height stress index or dry matter stress in- dex of four seedling chicory. It is concluded that LWC, LRWC, height, root-shoot ratio, LREC and LSSC can be used as the main evaluation index, while aboveground biomass, underground biomass, plant height stress index, dry matter stress index and proline can only be used as reference indexes for drought resistance evalua- tion of chicory. The capacity of drought resistance by subordinate function analysis of the four chicories was gauged as： C2〉C1〉C4〉C3. This accorded with their practical performance.