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作 者 ：韩占江；程龙；李志军*

期 刊 ：植物研究 2016年 36卷 2期 页码：266-273

关键词：藜科植物；干旱胁迫；种子萌发；抗旱性评价；

Keywords:Chenopodiaceae, drought stress, seed germination, drought resistance evaluation,

摘 要 ：以塔里木盆地分布的碱蓬、硬枝碱蓬、盘果碱蓬、五蕊碱蓬、星花碱蓬、刺藜、盐节木、盐穗木、盐角草、白茎盐生草等10种藜科植物的种子为材料，利用PEG-6000模拟干旱，研究种子萌发对干旱胁迫的响应规律，并对抗旱性进行综合评价。结果表明：（1）随渗透势的下降，干旱胁迫加重，10种藜科植物种子的最终萌发率受到不同程度的抑制，平均萌发时间逐渐延长，种子的胚根长度受到抑制；解除干旱胁迫后，碱蓬、硬枝碱蓬、盘果碱蓬、盐节木、盐穗木、盐角草和白茎盐生草种子可恢复萌发；（2）10种藜科植物种子萌发期抗旱（PEG）极限值从大到小依次为：盐穗木＞白茎盐生草＞盘果碱蓬＞硬枝碱蓬＞盐角草＞五蕊碱蓬＞盐节木＞星花碱蓬＞刺藜＞碱蓬；（3）采用隶属函数法，选取种子最终萌发率、平均萌发时间、胚根长度和恢复萌发率为主要评价指标，进行抗旱性综合评价，10种藜科植物种子抗旱性由强到弱依次为：盐穗木＞白茎盐生草＞硬枝碱蓬＞盐节木＞盘果碱蓬＞星花碱蓬＞盐角草＞刺藜＞碱蓬＞五蕊碱蓬；抗旱性较强的盐穗木、白茎盐生草、硬枝碱蓬和盐节木的隶属函数加权平均值分别为0.915、0.793、0.762和0.737。

Abstract:The experiments were conducted with ten Chenopodiaceae seeds as materials to examine responses of seed germination and evaluate their tolerance under drought stress by PEG-6000. The final germination rates and radicle length of seeds were inhibited while the mean germination times extended continuously in various degrees with the drought intensifying in 10 Chenopodiaceae species. Seeds of Suaeda glauca, Suaeda rigida, Suaeda heterophylla, Halocnermum strobilaceum, Halostachys caspica, Salicornia europaea and Halogeton arachnoideus obtained their germination recoveries after relieving drought stresses. The limit values of drought tolerance at seed germination stage from large to small were H.caspica, H.arachnoideus, S.heterophylla, S.rigida, S.europaea, Suaeda arcuata, H.strobilaceum, Suaeda stellatiflora, Chenopodium aristatum and S.glauca. Comprehensive evaluation of drought resistances of seed germination were conducted with fuzzy subordinate function analysis by selecting the final genmination rate, mean generation time, radicle length and germination recovery rate. The drought resistances at seed germination stage from large to small were H.caspica, H.arachnoideus, S.rigida, H.strobilaceum, S.heterophylla, S.stellatiflora, S.europaea, C.aristatum, S.glauca and S.arcuata. Seed germinations of H.caspica, H.arachnoideus, S.rigida and H.strobilaceum showed the best resistances under drought stresses between ten Chenopodiaceae species, and their weighted average values of subordinate function were 0.915, 0.793, 0.762 and 0.737, respectively.

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