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| 1 | 椰林自然遮阴对间作节水抗旱稻光合特性及产量的影响显示文摘节水抗旱稻是一类新型的杂交水稻,兼具水稻的高产、旱稻的广适性特点,是应用于旱地间作的优选作物。为了探明不同密度椰林自然遮阴对间作节水抗旱稻光合特性与产量的影响,以节水抗旱稻(旱优113号)为研究材料,设置3个遮阴处理[分别为椰林株行距4 m×8 m(15%遮阴度)、椰林株行距4 m×6 m(25%遮阴度)、椰林株行距4 m×4 m(35%遮阴度)],以大田单作节水抗旱稻为对照(0%遮阴度),分析林下节水抗旱稻叶绿素含量、光合参数、叶绿素荧光参数和产量的差异。光合特性结果表明:随着椰林遮阴度的增加,节水抗旱稻叶绿素含量显著降低,净光合速率先显著降低后略增再降,蒸腾速率、气孔导度和胞间CO_(2)浓度显著降低,PSⅡ潜在活性和PSⅡ原初光能转化效率先显著降低后略增。当林下遮阴度高于25%时,节水抗旱稻的光合作用受到较大胁迫。产量结果表明:随着椰林遮阴度的增加,节水抗旱稻的产量显著减少,但在25%遮阴度内,产量可达4983 kg/hm^(2)以上。研究发现,在椰林间作节水抗旱稻模式中,当林下遮阴度不高于25%时,水稻光合作用可正常进行,产量达标,因此推荐间作节水抗旱稻的椰林株行距不低于4 m×6 m。 | 余若云 杨伟波 朱里 余新桥 | 2022 | 江苏农业科学2022，50，22： | 2 |
| 2 | Functions of Nitrogen,Phosphorus and Potassium in Energy Status and Their Influences on Rice Growth and Development显示文摘Nitrogen(N),phosphorus(P)and potassium(K)are important essential nutrients for plant growth and development,but their functions in energy status remains unclear.Here,we grew Nipponbare rice seedlings in a growth chamber for 20 d at 30℃/24℃day/night)under natural sunlight conditions with different nutrient regimes.The results showed that N had the strongest influence on the plant growth and development,followed by P and K.The highest nonstructural carbohydrate content,dry matter weight,net photosynthetic rate(Pn),ATP content,as well as NADH dehydrogenase,cytochrome oxidase and ATPase activities were found in the plants that received sufficient N,P and K.The lowest values of these parameters were detected in the N-deficient plants.Higher dry matter accumulation was observed in the K-deficient than in the P-deficient treatments,but there was no significant difference in the ratio of respiration rate to Pn between these two treatments,suggesting that differences in energy production efficiency may have accounted for this result.This hypothesis was confirmed by higher ATP contents and activities of NADH dehydrogenase,cytochrome oxidase and ATPase in the K-deficient plants than in the P-deficient plants.We therefore inferred different abilities in energy production efficiency among N,P and K in rice seedlings,which determined rice plant growth and development. | MA Jiaying CHEN Tingting LIN Jie FU Weimeng FENG Baohua LI Guangyan LI Hubo LI Juncai WU Zhihai TAO Longxing FU Guanfu | 2022 | Rice science2022，29，2： | 0 |
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