大田生长条件下,以普通玉米为对照比较研究了高油玉米授粉后氮的吸收与分配规律。结果表明,与普通玉米相比,高油玉米籽粒灌浆期间籽粒氮的百分含量较高,而叶片和茎秆中氮的百分含量低于普通玉米,成熟期植株中的氮在籽粒中的分配比例较...大田生长条件下,以普通玉米为对照比较研究了高油玉米授粉后氮的吸收与分配规律。结果表明,与普通玉米相比,高油玉米籽粒灌浆期间籽粒氮的百分含量较高,而叶片和茎秆中氮的百分含量低于普通玉米,成熟期植株中的氮在籽粒中的分配比例较普通玉米高,平均高6.9%;形成100 kg 籽粒所需氮量高于普通玉米,平均高0.13 kg,但品种间存在较大差异;营养体中氮的输出率比普通玉米低,籽粒中氮的来源主要依赖于籽粒灌浆期间直接从土壤中的吸收,占籽粒氮的70.05%(普通玉米为40.65%)。说明高油玉米的需氮量大且籽粒灌浆期间吸收的比例相对较高。展开更多
On the basis of the phytotron, the effects of high temperature （daily average temperature 25, 30, 35 and 40℃, respectively） on antioxidant enzymes and lipid peroxidation in flag leaves of wheat at 50% relative air ...On the basis of the phytotron, the effects of high temperature （daily average temperature 25, 30, 35 and 40℃, respectively） on antioxidant enzymes and lipid peroxidation in flag leaves of wheat at 50% relative air moisture during grain fastest filling stage [19-21 days after anthesis （DAA）] were studied. The wheat cultivars tested were Yangmai 9 with weak-gluten and Yangmai 12 with medium-gluten. Compared with 25℃, the higher the temperature was, the higher was the MDA content in flag leaves, while lower were the SOD, POD, and CAT activities. SOD and CAT activities in Yangmai 12 appeared to be more sensitive to high temperature than that in Yangmai 9. But POD activity in Yangmai 12 was less sensitive to high temperature. MDA content in Yangmai 12 was higher than that in Yangmai 9. The 1000-grain weight declined with increase in temperature.展开更多
文摘大田生长条件下,以普通玉米为对照比较研究了高油玉米授粉后氮的吸收与分配规律。结果表明,与普通玉米相比,高油玉米籽粒灌浆期间籽粒氮的百分含量较高,而叶片和茎秆中氮的百分含量低于普通玉米,成熟期植株中的氮在籽粒中的分配比例较普通玉米高,平均高6.9%;形成100 kg 籽粒所需氮量高于普通玉米,平均高0.13 kg,但品种间存在较大差异;营养体中氮的输出率比普通玉米低,籽粒中氮的来源主要依赖于籽粒灌浆期间直接从土壤中的吸收,占籽粒氮的70.05%(普通玉米为40.65%)。说明高油玉米的需氮量大且籽粒灌浆期间吸收的比例相对较高。
基金This research work was financially supported by the National Natural Science Foundation of China(30571091,30170540).
文摘On the basis of the phytotron, the effects of high temperature （daily average temperature 25, 30, 35 and 40℃, respectively） on antioxidant enzymes and lipid peroxidation in flag leaves of wheat at 50% relative air moisture during grain fastest filling stage [19-21 days after anthesis （DAA）] were studied. The wheat cultivars tested were Yangmai 9 with weak-gluten and Yangmai 12 with medium-gluten. Compared with 25℃, the higher the temperature was, the higher was the MDA content in flag leaves, while lower were the SOD, POD, and CAT activities. SOD and CAT activities in Yangmai 12 appeared to be more sensitive to high temperature than that in Yangmai 9. But POD activity in Yangmai 12 was less sensitive to high temperature. MDA content in Yangmai 12 was higher than that in Yangmai 9. The 1000-grain weight declined with increase in temperature.
