当前位置: 首页 > 文章 > 无核白鸡心葡萄离体叶水势与叶柄木质部液流的关系 中国农业大学学报 2008,13 (2) 35-38
Position: Home > Articles > Relation of leaf water potentials with petiole xylem sap flow of excised leaves in grapevine Journal of China Agricultural University 2008,13 (2) 35-38

无核白鸡心葡萄离体叶水势与叶柄木质部液流的关系

作  者:
马跃青;袁小艳;刘丽平;邓西民
单  位:
中国农业大学水利与土木工程学院;中国农业大学农学与生物技术学院;中国农业大学后勤基建处
关键词:
葡萄;叶水势;木质部;压力梯度;液流通量;液流速率
摘  要:
以无核白鸡心葡萄(Vitis vinifera L.)离体叶为试材,研究了叶水势与叶柄木质部液流通量、液流速率和液流压力梯度之间的关系。结果表明:0~-0.9 MPa范围内,在葡萄离体叶水势与叶柄木质部液流压力梯度(R2=0.958 9)之间的关系比与叶柄木质部液流通量(R2=0.668 4)和液流速率(R2=0.694 6)之间的关系更密切;因此,通过测定叶柄木质部液流压力梯度有可能提供一种比较准确敏捷地监测植物叶动态水势的新方法。
译  名:
Relation of leaf water potentials with petiole xylem sap flow of excised leaves in grapevine
作  者:
MA Yue-qing1,YUAN Xiao-yan2,LIU Li-ping3,DENG Xi-min1(1.College of Agronomy and Biotechnology,China Agricultural University,Beijing 100094,China;2.College of Water Conservancy and Civil Engineering,China Agricultural University,Beijing 100083,China;3.Division of Logistics and Construction,China Agricultural University,Beijing 100094)
关键词:
Vitis vinifera;leaf water potential;xylem;pressure gradient;sap flow rate;sap flow velocity
摘  要:
This paper reports the relations of leaf water potentials with petiole xylem sap flow of excised leaves in grapevine(Vitis vinifera L.).Leaf water potential,ranging 0-0.9 MPa,was reversely and much closely related with sap pressure gradient(R2=0.958 9),comparing that with sap flow rate(R2=0.668 4) and sap flow velocity(R2=0.694 6) in the xylem of petioles.It may be thus concluded that xylem sap pressure gradient can be used as a novel alternative parameter to monitor dynamic leaf water potential in plants.

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