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| 水分对甜菜光合及叶绿素荧光特性的影响 |
| Effects of Water Stress on Photosynthesis and Chlorophyll Fluorescence of the Sugar Beet |
| 投稿时间：2015-03-20 |
| DOI：10.13254/j.jare.2015.0075 |
| 中文关键词: 甜菜 水分胁迫 复水 光合作用 叶绿素荧光 |
| 英文关键词: sugar beet water stress rewatering photosynthesis chlorophyll fluorescence |
| 基金项目:农业部公益性行业(农业)科研专项(201003053);张家口市科学技术研究与发展计划(12110036C) |
| 作者 | 单位 | E-mail | | 韩凯虹 | 河北农业大学农学院, 河北 保定 071000
农业部张北农业资源与生态环境重点野外科学观测试验站, 河北 张家口 076450 | | | 刘玉华 | 河北农业大学农学院, 河北 保定 071000
农业部张北农业资源与生态环境重点野外科学观测试验站, 河北 张家口 076450 | | | 张继宗 | 河北农业大学农学院, 河北 保定 071000
农业部张北农业资源与生态环境重点野外科学观测试验站, 河北 张家口 076450 | | | 郝雅星 | 河北农业大学农学院, 河北 保定 071000
农业部张北农业资源与生态环境重点野外科学观测试验站, 河北 张家口 076450 | | | 王伟婧 | 河北农业大学农学院, 河北 保定 071000
农业部张北农业资源与生态环境重点野外科学观测试验站, 河北 张家口 076450 | | | 张立峰 | 河北农业大学农学院, 河北 保定 071000
农业部张北农业资源与生态环境重点野外科学观测试验站, 河北 张家口 076450 | zlf@hebau.edu.cn |
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| 中文摘要: |
| 为了探讨水分胁迫及复水对甜菜生产及其相应光合参数的影响,为甜菜田水分管理提供依据,采用人工防雨棚,设置了不同时期水分胁迫及复水的池栽试验,研究甜菜净光合速率(Pn)、蒸腾速率(Tr)、水分利用效率(WUE)及气孔限制值(Ls)、胞间CO2浓度(Ci)、PSⅡ最大光化学量子产量(Fv/Fm)的变化。结果表明,全生育期补水(CK)处理不同时期甜菜Tr与Pn日变化近"单峰"型,缺水使其呈现"双峰"变化。水分胁迫使甜菜糖分积累期日蒸腾量(DTC)降低70.16%～74.81%,日光合量(DPC)降低63.48%～69.96%,日水分利用效率(WUEd)则提高19.28%～22.39%;胁迫后复水促使Tr与Pn恢复,但不能达到未受胁迫水平。极度缺水环境下Ls日变化具有午间低谷的"双峰"特征,Ci出现与Ls时序一致的"双谷"特征,水分胁迫导致了午间PSⅡ光化学反应中心的抑制与失活。水分胁迫导致Pn与Tr的非可逆性降低及Pn低效期的延长,成为影响甜菜生产的重要原因。 |
| 英文摘要: |
| To investigate the effect of water stress and rewatering on sugar beet yield and its corresponding photosynthetic parameters, and to provide the basis of water management for the sugar beet fields, pool experiments in an artificial proof canopy were set up to observe changes of beet net photosynthetic rate(Pn), transpiration rate(Tr), water use efficiency(WUE) and stomatal limitation (Ls), intercellular CO2 oncentration(Ci), and PSⅡ maximum quantum yield(Fv/Fm). The results indicated that the diurnal variation of Tr and Pn in CK treatment (whole growth period replenishment) at different times near "unimodal" type; and water shortage treatments presented "twin peaks" change. Diurnal transpiration capacity(DTC) under water stress at sugar accumulation stage reduced by 70.16%~74.81% and diurnal photosynthetic capacity(DPC) was 63.48%~69.96% lower than that of CK, while diurnal water use efficiency(WUEd) increased by 19.28%~22.39%. Rehydration helped Tr and Pn recovery, but did not reach unstressed levels. Ls changes under extremely dry environment had a midday trough "twin peaks" feature, and Ci was at "double-dip" in consistent with the timing of Ls; Water stress inhibited and inactivated photochemical reaction center of midday PSⅡ. Water stress led to irreversible decrease in the Pn and Tr, and prolonged the Pn inefficient period, which become the important factor of influencing the sugar beet yield. |
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