| 珙桐苗木叶片光合特性对土壤干旱胁迫的响应 |
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| 引用本文： | 王宁宁,胡增辉,沈应柏.珙桐苗木叶片光合特性对土壤干旱胁迫的响应[J].西北植物学报,2011,31(1):101-108. |
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| 作者姓名： | 王宁宁 胡增辉 沈应柏 |
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| 作者单位： | 1. 北京林业大学,生物科学与技术学院,北京,100083
2. 北京林业大学,生物科学与技术学院,北京,100083;北京农学院,园林系,北京,102206 |
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| 基金项目： | 国家自然科学资助重点项目(30330490) |
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| 摘 要： | 通过控制土壤含水量,研究了土壤干旱胁迫对2年生珙桐(Davidia involucrata Baill.)幼苗叶面积、叶绿素含量、光合作用及叶绿素荧光参数的影响,以探讨珙桐光合作用对土壤干旱胁迫的响应机理.结果表明,干旱胁迫后,珙桐叶片失水脱落,各干旱胁迫处理叶面积比对照显著降低23%～98%,但单位面积的叶绿素含量却无显著变化;干旱处理的珙桐幼苗净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、水分利用效率(WUE)显著低于对照(P<0.05);干旱胁迫对珙桐幼苗叶片的初始荧光产量(F0)及最大荧光产量(Fm)没有产生显著影响,却显著降低了PSⅡ最大光化学量子产量(Fv/Fm)、PSⅡ实际光化学量子产量(Yield)、电子传递速率(ETR)及光化学淬灭系数(qP),使非光化学淬灭系数(qN)显著升高(P<0.05).研究发现,土壤水分亏缺对珙桐叶片的光合系统造成了不可逆的伤害,严重抑制了其正常的光合作用和生长发育;珙桐幼苗对土壤干旱胁迫极为敏感.
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| 关 键 词： | 珙桐 干旱胁迫 光合特性 |
Photosynthetic Characteristics of Davidia involucrata Baill. Seedlings under Soil Drought Stress |
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| WANG Ning-ning,HU Zeng-hui,SHEN Ying-bai.Photosynthetic Characteristics of Davidia involucrata Baill. Seedlings under Soil Drought Stress[J].Acta Botanica Boreali-Occidentalia Sinica,2011,31(1):101-108. |
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| Authors: | WANG Ning-ning HU Zeng-hui SHEN Ying-bai |
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| Institution: | WANG Ning-ning1,HU Zeng-hui1,2,SHEN Ying-bai1(1 College of Biological Sciences and Technology,Beijing Forestry University,Beijing 100083,China,2 Garden Department,Beijing University of Agriculture,Beijing 102206,China) |
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| Abstract: | With control soil water content,the effects of soil drought stress on leaf area,chlorophyll content,photosynthetic and chlorophyll florescence parameters of two-year-old Davidia involucrata seedlings were measured.The purpose was to investigate the response of photo-system of D.involucrata to soil drought stress.The result showed that drought made the seedlings lost water quickly and leaves fell off soon,leaf area reduced sharply.Each treatment were significantly lower 23% to 98% than that of control,but th... |
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| Keywords: | Davidia involucrata Baill drought stress photosynthetic characteristic |
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