耐密植大豆品种沈农12叶片性状研究

Leaf Traits of Soybean Cultivar Shennong 12 with Tolerance to High Planting Density

以耐密植大豆沈农12和普通大豆辽豆11为试材,在不同种植密度(7.5、15.0、22.5、30.0、37.5、45.0万株.hm-2)下,比较了2个品种的叶片性状。结果表明:耐密植品种沈农12叶形指数较高、叶柄较短、叶倾角较小,有利于密植栽培;随着种植密度增加,在一定密度范围内叶形指数、叶柄长度均随密度增加而增大;耐密性不同的品种叶柄长度随密度而增加的幅度不同,沈农12增幅较小;叶倾角也有随密度增加而减小的趋势。沈农12叶片性状有利于叶片的受光态势,因而,该品种的净光合速率较高,并且随着密度增加其叶片的净光合速率下降幅度较小。

Leaf traits were studied under different planting densities with soybean cuhivar Shennong 12 ,which is tolerant to high planting density, and normal cultivar Liaodou 11. The results showed that Shennong 12 had higher leaf shape index, shorter petiole, and smaller leaf angle, which benefited its tolerance to high planting density. As the increment of planting density, leaf shape index and petiole length would increased. Shennong 12 had a small increment of petiole length with the increasing of planting density compared with Liaodou 11. There was a decrease trend of leaf angle as the increment of planting density. All of these leaf traits of Shennong 12 contributed to its higher leaf net photosynthetic rate, and the rate decreased fewer as the increment of planting density, compared with the normal cultivar.