Studies On Light And Temperature Effects And Inheritance Mode Of Allelopatic Weed Suppression Abilities

In order to study the interaction between suppression alleloathic of wheat and light temperature conditions and gentic model,a group of wheat materials preserved in our laboratory were choiced as donors,the chickweed(Malachium aquatium L.)and amur foxtail(Alopecurus japonicus)which are associated weeds in wheat were selected as receptors,then the inhibitory effect of wheat on weeds was studied by aqueous extract screening bioassays on leaves method,relay seeding in Vermiculite method,to study the allelopathic potential difference of different varieties to different receptors in different light temperature conditions,effects of different light intensities on the content of allelochemicals in wheat leaves.Genetic analysis of progeny populations constructed from two cross combinations selected in the laboratory,the inhibition rates of the root exudates of the parents,F1 and F3 populations on the root length.The main results are as follows:1?With the increase of light intensity,the inhibitory effect of wheat root exudates on weeds gradually increased.At 30000 Lux,the inhibitory effect was the strongest,when the light intensity was from 18000 Lux to 30000 Lux,there was no significant difference in inhibition rates from each other.When the light intensity was between 12000 and 18000 Lux,the wheat leaf extract had the strongest inhibitory effect on weeds.Therefore,when the identification of the root allelopathic potential of wheat in the artificial incubator was selected to be 18000 Lux,and it was most suitable to determine the light intensity of the wheat leaf extract when it was 12000-18000 Lux.2?With the increase of temperature,the inhibitory effect of wheat root exudates on weeds increased first and then weakened,at 30 ?,the inhibition was the strongest.The inhibitory effect of the wheat leaf extract on the weeds increased with increasing temperature and then weakened,at 25 ? to 30 ?,the inhibition of weeds was the strongest.Therefore,when wheat allelopathic potential was identified in an artificialincubator,the root inhibition of wheat was measured at 30 ?,and it was suitable to determine the inhibitory effect of wheat leaf extract to 25-30 ?.3?With the increase of light intensity,the content of DIMBOA in wheat leaves first increased and then decreased.The correlation analysis between the content of DIMBOA in wheat leaves and the inhibitory rate of wheat root exudation revealed that when light exposure was 24000 Lux and 30000 Lux,the content of leaf DIMBOA was significantly related to the inhibition rate of roots to weeds,and the correlation coefficients were 0.592 and 0.636,respectively.The analysis of the correlation between the content of butylate in wheat leaves and the inhibitory rate of wheat leaf extract showed that there was no significant correlation between the two.4?The inhibitory effect of wheat population on the receptors of chickweed is basically continuous and normal distribution,and it was initially proved that wheat allelopathic was a quantitative trait.In this experiment,the heritability of wheat cultivar10-197-13 × K8 was 75.33%,and the heritability of plant height was 26.98%.The heritability of the wheat variety T2003 × 10-114 against the root length of C.communis was 35.05%,and the heritability of the plant height inhibition rate was 14.5%.