干旱胁迫下不同绣球品种生理响应与抗旱性评价

探究不同干旱胁迫对绣球生长的影响,评价其抗旱性。以6个绣球品种为试材,利用盆栽控水法,分别设置常态(CK)、轻度干旱胁迫(T1)、中度干旱胁迫(T2)、重干旱胁迫(T3)和特重干旱胁迫(T4)处理模拟干旱胁迫,测定其生物量、根冠比、叶片相对含水量、细胞膜透性、叶绿素(Chl)和类胡萝卜素(Car)、丙二醛(MDA)、脯氨酸(Pro)、过氧化物酶(POD)、超氧化物歧化酶(SOD)、可溶性糖(SS)和可溶性蛋白(SP)等15个生理指标的动态变化,运用主成分分析法、隶属函数法和聚类分析法对其抗旱性进行综合评价。在干旱胁迫下,各绣球品种的生物量和相对含水量呈下降趋势,根冠比、相对电导率、MDA、Pro和SS呈上升趋势,但各品种上升幅度有所差异,SOD、POD和SP呈先上升后下降的趋势,绣球的光合色素变化规律不明显。6种绣球抗旱性由强到弱排序为:万华镜>爱你的吻>头花>白色天使>花手鞠>夏祭。

Physiological response and drought resistance evaluation of different Hydrangea varieties under drought stress

In order to explore the effects of different drought stresses on the growth of Hydrangea varieties and evaluate their drought resistance, six Hydrangea varieties were used as test materials, and were treated with normal (CK), mild drought stress (T1), moderate drought stress (T2), severe drought stress (T3) and extra severe drought stress (T4) to simulate drought stress. Their biomass, root-shoot ratio, leaf relative water content, cell membrane permeability, chlorophyll (Chl) and carotenoid (Car), malondialdehyde (MDA), proline (Pro), peroxidase (POD), superoxide dismutase (SOD), soluble sugar (SS) and soluble protein (SP) were measured. Under drought stress, the biomass and relative water content of each Hydrangea variety showed a downward trend, while the root-shoot ratio, relative conductivity, MDA, Pro and SS showed an upward trend. However, the increase range of each variety was different. SOD, POD and SP showed an upward trend first and then a decreased trend. The change rule of photosynthetic pigment of Hydrangea was not obvious. The order of drought resistance of 6 Hydrangea varieties from strong to weak was as follows: Mangek you>Love You Kiss>Corsage>White Angel>Stockings>Summer Sacrifice.