黄瓜根系分泌物化感作用的初步研究

Study on Allelopathy of Cucumber Root Exudates

以黄瓜自根苗和嫁接苗为试材,测定了不同收集温度(20℃、25℃、30℃)下黄瓜根系的分泌物量,并研究了不同类型黄瓜幼苗根系分泌物对黄瓜和南瓜种子萌发及幼苗生长的影响。结果表明:随着温度的升高,黄瓜自根苗和嫁接苗的根系分泌物量均逐渐增加,在30℃条件下根系分泌物量最多,且自根苗的根系分泌物量明显多于嫁接苗。黄瓜根系分泌物对黄瓜和南瓜种子的发芽率、发芽势以及胚根和胚轴的伸长均具有明显的抑制作用,且抑制作用随着根系分泌物浓度的降低而减弱。黄瓜根系分泌物对黄瓜种子萌发和幼苗生长具有抑制作用,通过嫁接可以在一定程度上减轻这种抑制作用。嫁接黄瓜虽然可以在一定程度上减轻黄瓜根系分泌物引起的自毒作用,但仍然能产生连作障碍。

Taking cucumber own-rooted seedlings and grafted seedlings as the test materials, the secretion of cucumber root in different collection temperatures （20℃, 25℃, 30℃） was investigated, and the effects of different types cucumber seedling root exudates on seeds germination and seedling growth of cucumber and pumpkin were studied. The results showed that the root secretion amount was gradually increased with the increasing of temperature, when the temperature was up to 30 ℃, the root secretion amount was maximum, and the amount of own-rooted seedlings was more than that of grafted seedlings. Root exudates of cucumber had different degree of inhibition to seeds germination rate, germination potential, elongation of radicle and hypocotyls of cucumber and pumpkin, the inhibition was weakened with the decreasing of root exudates concentration. Root exudates of cucumber had different degree of inhibition to seeds germination and seedling growth of cucumber, and the inhibition was decreased to a certain extent by still produce continues cropping obstaclel grafting , grafted cucumber could reduce the autotoxic, but it could still produce continues cropping obstacle.