苦瓜植株水浸提液对水稻种子萌发和秧苗生长的影响

旨在明确苦瓜植株对后茬水稻的化感作用潜力,为稻菜轮作制度的应用提供指导.以苦瓜植株残体为试验材料,用培养皿法和水培法研究其水浸提液对3种水稻('特籼占25'、'博Ⅱ优818'和'Ⅱ优129')种子萌发和秧苗生长的影响.结果 表明:水浸提液仅在浓度达0.20g/mL时降低了3种水稻种子的发芽率,降低'博Ⅱ优818'和'Ⅱ...

Plant Aqueous Extract of Momordica charantia: Effects on Rice Seed Germination and Seedling Growth

The aim is to clarify the allelopathic potential of Momordica charantia plants on succeeding rice and provide guidance for the application of rice-vegetable rotation system. The experiment was conducted with plant residues of M. charantia as experimental materials, the allelopathic effects of its aqueous extract on seed germination and seedling growth of three rice varieties (‘Texianzhan 25’, ‘BoⅡyou 818’ and ‘Ⅱyou 129’) were studied by petri dish and water culture methods. The results showed that the germination rates of the three rice varieties’ seeds were reduced when the concentration of aqueous extract only reached 0.20 g/mL, the seed vigor indexes of ‘BoⅡyou 818’ and ‘Ⅱyou 129’ were reduced, and the average germination time of ‘Texianzhan 25’ was prolonged by 1.13 days, but the germination inhibition rate was less than 20% and the seed vigor index inhibition rate was less than 30%. Although the root elongation of ‘Texianzhan 25’ seedlings was inhibited by dose-dependent effect, the aqueous extract was beneficial to the distribution of the total biomass of the three rice varieties’ seedlings to the aboveground parts. The aqueous extract with concentration≤0.15 g/mL had no effect or promoting effect on seedling height and total biomass, and the inhibition rate of total biomass was less than 28% when the concentration reached 0.20 g/mL. Therefore, the allelopathic inhibition effect of M. charantia on succeeding rice is weak.