Changes and mechanism in response of photosynthetic rates of lucerne residueto cutting under different water treatments

Abstract

Abstract: The changes in photosynthetic rate and its mechanism during lucerne (Medicago sativa) regrowth after cutting were investigated in a greenhouse experiment. Photosynthetic rate (Pn), stomatal conductance (gs), contents of malondialchehyche (MDA) and proline, and the activities of superoxidase (SOD), peroxidase (POD) and catalase (CAT) were measured at different soil water availabilities and cutting. Pn and gs increased shortly after cutting. Leaf MDA content decreased 10 h after cutting, while proline content increased. In addition, activity of antioxidases, including SOD, POD and CAT, increased shortly after cutting. The same trend of changes was observed under both water treatments, but significant difference appeared between treatments. It is suggested that cutting stimuli may reduce water stress within the plant body, enhancing osmotic adjustment and clearance of oxygen species, promoting normal functions of plant organs like stomatal movement. Thus, enough CO₂ can be supplied and Pn is then maintained and even enhanced.

CLC Number:

HE Shu-bin, LIU Guo-li, YANG Hui-min. Changes and mechanism in response of photosynthetic rates of lucerne residueto cutting under different water treatments[J]. Acta Prataculturae Sinica, 2009, 18(6): 192-197.

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