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EFFECTS OF DIFFERENT ROOT ZONE TEMPERATURE ON GROWTH AND PHOTOSYNTHETIC PARAMETERS OF CUCUMBER SEEDLINGS

Ren Zhi-yu

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Abstract

Experiments of different root zone temperature treatments(optimal temperature CK is 21-23℃; sub-optimal temperature is 14-16℃; low temperature is 8-10℃)were carried out at seedling stage of cucumber(cucumis sativus L.) in solar greenhouse. Comparison of sub-optimal and low temperature treatments with optimal temperature treatment(CK) indicated that (1) plant height, stem thickness, leaf area, dry weight of shoot, and total dry weight of cucumber seedlings were decreased, while dry weight of root and root:shoot ratio of cucumber seedlings were increased; (2) photosynthetic pigment content, photosynthetic rate (Pn), stomatal conductance (Gs), and intercellular CO 2 concentration (Ci) of cucumber seedling leaf were decreased,but the value of chla/b increased. Cultivar Jinchun No.3(J3) showed more root resistance to low temperature stress than that of cultivar Jinchun No.2(J2).

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What this paper is about

Experiments of different root zone temperature treatments(optimal temperature CK is 21-23℃; sub-optimal temperature is 14-16℃; low temperature is 8-10℃)were carried out at seedling stage of cucumber(cucumis sativus L.) in solar greenhouse. Comparison of sub-optimal and low temperature treatments with optimal temperature treatment(CK) indicated that (1) plant height, stem thickness, leaf area, dry weight of shoot, and total dry weight of cucumber seedlings were decreased, while dry weight of root and root:shoot ratio of cucumber seedlings were increased; (2) photosynthetic pigment content, photosynthetic rate (Pn), stomatal conductance (Gs), and intercellular CO 2 concentration (Ci) of cucumber seedling leaf were decreased,but the value of chla/b increased. Cultivar Jinchun No.3(J3) showed more root resistance to low temperature stress than that of cultivar Jinchun No.2(J2).

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Available abstract

Experiments of different root zone temperature treatments(optimal temperature CK is 21-23℃; sub-optimal temperature is 14-16℃; low temperature is 8-10℃)were carried out at seedling stage of cucumber(cucumis sativus L.) in solar greenhouse. Comparison of sub-optimal and low temperature treatments with optimal temperature treatment(CK) indicated that (1) plant height, stem thickness, leaf area, dry weight of shoot, and total dry weight of cucumber seedlings were decreased, while dry weight of root and root:shoot ratio of cucumber seedlings were increased; (2) photosynthetic pigment content, photosynthetic rate (Pn), stomatal conductance (Gs), and intercellular CO 2 concentration (Ci) of cucumber seedling leaf were decreased,but the value of chla/b increased. Cultivar Jinchun No.3(J3) showed more root resistance to low temperature stress than that of cultivar Jinchun No.2(J2).

Key concepts: Cucumis, Seedling, Photosynthesis, Dry weight, Shoot, Cultivar, Stomatal conductance, Horticulture

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EFFECTS OF DIFFERENT ROOT ZONE TEMPERATURE ON GROWTH AND PHOTOSYNTHETIC PARAMETERS OF CUCUMBER SEEDLINGS — Research Paper | ScholarLens