Effect of sugar solution infused into mungbean (Vigna radiata (L.) Wilczek) plant on seed yield and dry matter production

Effect of sugar solution infused into mungbean (Vigna radiata (L.) Wilczek) plant on seed yield and dry matter production

2002

A:PS

The effects of sugar solutions, infused into mungbean (cv. Chinese) plants, on the dry matter production and seed yield were investigated. Seeds of this cultivar were sown on 15 May 2000, in Kyushu, Japan. After shoot emergence on 20 May, two seedlings were allowed to grown in a pot. The sugar solution was infused into the main stem of these plants using a glass tube. The treatments comprised: distilled water (control), 4 and 8% glucose solutions, and 4 and 8% sucrose solutions. Plants were grown for 27 days under continuous infusion of sugar solutions, and the dry weights of each organ and leaf area were measured. The results showed that the infusion of sugar solution had a significant effect on the dry matter production, seed yield and growth parameters of mungbean. Larger weights of carbon were supplied to plants by the application of high-concentration solutions (8% glucose or 8% sucrose). A significant, positive correlation was observed between the growth parameters and the artificially given carbon weight, which was calculated from the volume of the absorbed sugar solutions. The sugar solutions applied to the plants increased the dry matter production. However, the increase in dry matter production did not depend on then infused carbon itself, but depends on the photosynthetic enhancement caused by the increases in leaf area and net assimilation rate. The infused sugar solution also had a positive effect on the sink organ formation. The number of pods increased by 12-70%, which are regarded as the main cause of increase in pod dry matter weight and harvest index. The increased demand for photosynthates by enlarged sink capacity resulted in the increase of leaf area and net assimilation rate. The results suggests the possibility that a further genetic or cultivational improvement of leaf photosynthesis after the flowering stage leads to a more beneficial relationship between sink and source organs in the yield-determining proces

v.5(1):31-32, PLANT PRODUCTION SCIENCE

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