Effects of different boron concentrations on the morphology and foliar generalities of mung bean
不同供硼水平对绿豆植株形态及其叶片生长特征的影响(英文)

The effects of boron deficiency and toxicity on the morphology and foliar generalities of mung bean (Phaseolu s aureus Roxb) were investigated in hydroponic culture. Reduced biomass produ ction in response to limited supply of boron was accompanied by an increased sho ot to root ratio. Foliar generalities were also altered by boron deficiency: lea f expansion was inhibited together with specific leaf area (SLA), implying t hat there was a high leaf cell density due to restricted cell expansion. An incr eased leaf weight ratio (LWR) and inter-veinal chlorosis evidenced in boron deficient leaves may indicate excessive carbohydrate accumulation, leading to a decline in chlorophyll content. Compared with shoot to root ratio when optimum boron was supplied, high levels of boron did not induce significant changes in s hoot to root ratio, suggesting that supra-optimum boron has similar effects on shoot and root growth. Boron toxicity reduced total leaf area by way of abscissi on of the old leaves, but did not influence SLA or LWR.