| 弱光胁迫对南瓜幼苗的光合特性的影响 |
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| 引用本文： | 阳习鹏,朱卓娉,姜艳芳,邓 欣,谢 波,党建成,刘泽发.弱光胁迫对南瓜幼苗的光合特性的影响[J].现代农业科技,2022(7). |
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| 作者姓名： | 阳习鹏 朱卓娉 姜艳芳 邓 欣 谢 波 党建成 刘泽发 |
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| 作者单位： | 湖南人文科技学院,湖南人文科技学院,湖南人文科技学院,湖南人文科技学院,湖南人文科技学院,湖南人文科技学院,湖南人文科技学院 |
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| 基金项目： | 湖南省研究生科研创新项目印度南瓜核雄性不育两用系种质资源特性与不育机理研究(CX20190945)；南瓜优异基因资源创制及与育种技术研究与应用(2020NK2038)；南人文科技学院研究生科研创新项目 |
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| 摘 要： | 为探讨南瓜耐低温弱光性的特性，以4个不同品系（组合）的南瓜幼苗为材料，研究不同弱光条件下南瓜叶片胞间CO2浓度、蒸腾速率、气孔导度、叶片光合速率、叶绿素初始荧光（F0）、叶绿素最大荧光（Fm）和PSII最大光化学量子产量（Fv/Fm）的影响。结果表明，弱光条件下叶片胞间CO2浓度提高，随着弱光程度的增加，叶片的蒸腾速率、气孔导度呈先增后减趋势，NY-1和JB-1在遮光40%时，蒸腾速率和启动导度达到最高值，NY-1×JB-1随着遮光程度的增加，蒸腾速率下降。光合速率10-32、JB-1呈现递增趋势，NY-1呈现递减趋势，NY-1×JB-1为先增后减趋势。10-32、NY-1、JB-1的F0表现为显著降低的趋势，10-32、NY-1×JB-1随着遮光程度的增加Fm表现为先升后降的趋势，在遮光40%时有最大值，遮光80%时最低。NY-1、JB-1随着光照程度的增加Fm都表现为下降趋势，NY-1×JB-1的F0呈现先降后升再降的趋势。10-32、NY-1、JB-1、NY-1×JB-1随着遮光强度的增加Fv/Fm均表现上升。说明以上指标可作为衡量南瓜耐低温弱光性的指标，可为南瓜作物耐弱光品种筛选提供参考依据。
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| 关 键 词： | 南瓜 光合特性 叶绿素荧光 |
| 收稿时间： | 2021/8/16 0:00:00 |
| 修稿时间： | 2021/8/16 0:00:00 |
Effects of low light stress on photosynthetic characteristics of pumpkin seedlings |
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| Abstract: | In order to investigate the characteristics of low temperature and weak light tolerance of pumpkin, four different strains (combinations) of pumpkin seedlings were used as materials.?To study the effects of intercellular CO2 concentration, transpiration rate, stomatal conductance, leaf photosynthetic rate, initial chlorophyll fluorescence (F0), maximum chlorophyll fluorescence (Fm) and maximum photochemical quantum yield of PSII (Fv/Fm) on pumpkin leaves under different low light conditions.?The results showed that with the increase of low light intensity, the transpiration rate and stomatal conductance of leaves increased firstly and then decreased with the increase of low light intensity. The transpiration rate and start-up conductance of NY-1 and JB-1 reached the highest values when the shading degree was 40%. The transpiration rate of NY-1×JB-1 decreased with the increase of the shading degree.?The photosynthetic rate of 10-32 and JB-1 showed an increasing trend, while that of NY-1 showed a decreasing trend. The photosynthetic rate of NY-1×JB-1 showed an increasing trend first and then a decreasing trend.?F0 of 10-32, NY-1 and JB-1 showed a trend of significant decrease, while Fm of 10-32, NY-1×JB-1 showed a trend of first increase and then decrease with the increase of shading degree, with the maximum value at 40% shading and the lowest value at 80% shading.?Fm of NY-1 and JB-1 showed a downward trend with the increase of light intensity, and F0 of NY-1×JB-1 showed a downward trend first, then an upward trend and then a downward trend.?The Fv/Fm performance of 10-32, NY-1, JB-1 and NY-1×JB-1 increased with the increase of shading intensity.?The above indexes can be used to evaluate the low temperature and low light tolerance of pumpkin and provide reference for the selection of low light tolerance varieties of pumpkin crops. |
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