干旱胁迫对黄柳雌雄扦插苗生长和生理特性的影响
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引用本文:马少薇,刘果厚,王 蕾,兰 庆,胥 晓.干旱胁迫对黄柳雌雄扦插苗生长和生理特性的影响[J].西北植物学报,2019,39(7):1250~1258
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马少薇1,刘果厚1*,王 蕾1,兰 庆1,胥 晓1,2 (1 内蒙古农业大学 草原与资源环境学院呼和浩特 0100192 西华师范大学 生命科学学院四川南充 637002) 
基金项目:内蒙古自治区科学技术应用项目(20131902);
中文摘要:以黄柳雌雄扦插苗为试验材料,通过称重控水法研究干旱胁迫下其生长和生理特性,以揭示黄柳雌雄植株对干旱胁迫的生理适应性及抗逆能力差异。结果显示:(1)在对照处理下,黄柳雌雄扦插苗在株高、基径、总叶片数、单叶面积、茎干重、根干重、光合色素含量(除叶绿素a)、气体交换、叶绿素荧光、叶片相对含水量(RWC)、丙二醛(MDA)含量、脯氨酸含量和可溶性糖含量等方面均没有显著的性别差异。(2)干旱胁迫显著降低了黄柳雌雄扦插苗的生长和光合作用,扰乱了其渗透调节功能和抗氧化酶系统;与雄株相比,雌株具有较高的株高、总叶片数、单叶面积、茎干重、根干重、总叶绿素含量、净光合速率(Pn)、PSⅡ最大化学效率(Fv/Fm)、PSⅡ有效光量子产量(ΦPSⅡ)和叶片RWC,以及较低的非光化学淬灭系数(qN)、MDA含量、脯氨酸含量和可溶性糖含量;且雌株叶干重、叶绿素a含量、超氧化物歧化酶(SOD)活性和过氧化物酶(POD)活性始终大于雄株。研究表明,干旱胁迫对黄柳雌雄扦插苗的生长和生理特性均具有严重的抑制作用,且雌雄株之间的响应存在显著的性别差异;雌株通过维持较高的光合作用以保证植株的生长,从而表现出比雄株更强的抗旱性,这也是其天然种群性比偏雌的重要原因之一。
中文关键词:干旱胁迫  黄柳  雌雄异株  植株生长  生理特性
 
Effect of Drought Stress on Growth and Physiological Characteristics of Male and Female Salix gordejevii Cuttings
Abstract:Using male and female Salix gordejevii cuttings as experimental materials, we studied the growth and physiological characteristics under drought stress by weighing control soil moisture content to reveal sexual differences of physiological adaptability and resistance. The results showed that: (1) no significant differences were detected in plant height, basal diameter, total leaf number, leaf area, stem dry weight, root dry weight, photosynthetic pigment contents (except chlorophyll a), gas exchange, chlorophyll fluorescence, relative water content (RWC), malondialdehyde (MDA) content, proline content and soluble sugar content in both sexes. (2) Drought significantly reduced plant growth and photosynthesis, and seriously disrupted osmotic regulation function and antioxidant enzyme system between the sexes. Females exhibited significantly higher plant height, total leaf number, leaf area, stem dry weight, root dry weight, total chlorophyll content, net photosynthetic rate (Pn), maximum efficiency of PSⅡ (Fv/Fm), effective quantum yield of PSⅡ (ΦPSⅡ) and RWC, and lower non photochemical quenching coefficient (qN), MDA content, proline content and soluble sugar content than those of males. Meanwhile, leaf dry weight, chlorophyll a content, superoxide dismutase (SOD) activity and peroxidase (POD) activity of females were always higher than that of males. The results indicated that drought inhibited growth and physiological characteristics more in males than in females of S. gordejevii. Females possess greater drought resistance than males with higher photosynthesis maintaining plant growth under drought stress, which is one of the important reasons in determining female biased sex ratio in the long term.
keywords:drought stress  Salix gordejevii  dioecious  plant growth  physiological characteristic
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