干旱胁迫对东方百合根叶生理功能及花粉育性的影响
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国家自然科学基金(31360489);


Effects of Water Stress on Root, Leaf Function and Pollen Fertility of Cut Flower Oriental Lily
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    摘要:

    以东方百合‘Sorbonne’为材料,在持续干旱4、8、12、16、20、24 d及干旱24 d后复水4 d时分别取样,检测叶片叶绿素荧光参数、光合生理指标、抗氧化酶活性和丙二醛含量,并观测其茎生根发育情况以及调查植株在干旱胁迫期、复水期、开花期的花粉育性,明确干旱胁迫对百合根、叶生理功能及花粉育性的影响,探讨百合的抗旱生理机制。结果表明:(1)与对照相比,干旱处理组百合植株的叶绿素含量随着干旱时间延长而逐渐降低,处理4 d后百合开始明显受到干旱胁迫;胁迫4~8 d内,光合作用受到的胁迫主要是气孔因素所致;胁迫8~12 d期间,叶片荧光叶绿素指标开始急剧变化,光合作用受到的胁迫已开始从气孔因素转变为非气孔因素;胁迫12 d后,叶片丙二醛含量增加,膜质开始受到氧化;胁迫16 d时,叶片抗氧化酶系统活性达到峰值,随后开始降低,丙二醛累积随之增加,膜脂过氧化作用加剧;胁迫24 d时,叶片光合指标略有所恢复。(2)解除干旱胁迫复水4 d后,百合叶片光合生理指标均有所恢复,但未恢复到胁迫前水平。(3)与正常对照相比,经历干旱胁迫的百合根系随着干旱胁迫时间的延长先缩短变粗、数量减少,然后逐渐褐化并趋近萎缩,且根系干鲜重显著降低,但花粉育性在胁迫期、复水期及开花期没有显著变化。研究发现:持续24 d的干旱胁迫会对东方百合叶片的光合功能和抗氧化酶系统以及根系产生破坏性的伤害,但对花粉的育性没有影响。

    Abstract:

    This paper used oriental lily varieties ‘Sorboon’ as experimental material and set lasting 4, 8, 12, 16, 20, 24 days water stress and rewater 4 days after 24 days water stress.Chlorophyll content, photosynthetic characteristics, protective enzyme, MDA were tested and root system development situation was observed. Pollen fertility was also researched during water stress, rewater and flowering periods. The effects of root, leaf physiology function and pollen fertility under water stress situation were also discussed. The results show that: (1) compare with normal conditions, after 4 days water stress, lily begin to be effected. 4-8 days, stomatal limitation is the major factor to effect lily. 8-12 days, fluorescent chlorophyll index of leaf decreased dramatically. The limitation of photosynthetic had transferred from stomatal factor to non stomatal factor. After 12 days water stress, membrane began to be oxidized and MDA content increased. After 16 days, protective enzyme system was effected and antioxidant enzyme activity decreased gradually. At the end of water stress, index of fluorescent chlorophyll recovered slightly. (2) After 4 days rewater treatment, all index of photosynthesis recovered, but lower than the level of normal. The results show that chloroplast was destroyed under the 24 days water stress treatment. (3) Compare with the control, root system became short and thick firstly, then less, dry and shrink at last with water stress aggravate. Pollen fertility was no significant change during water stress, rewater and flowering periods. This research discovered: leaf photosynthetic function, protective enzyme and root system suffered damage after lasting 24 days water stress, but pollen fertility was normal under this situation. This study will provide important reference for water saving production and partly reveal the relationship between photosynthetic physiology and water stress of cut flower lily.

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贾文杰,王祥宁,马璐琳,等.干旱胁迫对东方百合根叶生理功能及花粉育性的影响[J].西北植物学报,2017,37(11):2194-2203

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  • 在线发布日期: 2017-12-26
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