Abstract: To provide theoretical help and scientific basis for sustainably increasing wheat yield and production efficiency with high water use efficiency,an experiment was conducted in an artificial glass rainproof shed to study the effects of 9 irrigation methods(different irrigation combination of irrigation stages and amount) on roots,photosynthesis,quality and yield of wheat.The results indicated that the total root length,total volume,total surface area,average diameter and total root tips of W1(adequate water was supplied during the whole growth period) were the highest,irrigation at jointing stage and heading stage could obtain equivalent root traits to W1 treatment.W2 (jointing stage 45 mm) and W3(heading stage 45 mm) treatments had the highest values of wheat canopy chlorophyll density under the condition of irrigation one times,and W5 (jointing stage 22.5 mm+heading stage 22.5 mm) had the highest values of wheat canopy chlorophyll density under the condition of irrigation two times.Under the same amount of irrigation water,the wheat photosynthesis was not obviously affected by the increasing of irrigation times,the combination of irrigation at jointing and heading stages was the best irrigation combination when irrigation two times during the whole growth period of wheat.Irrigation at heading stage can help to enhance protein content when compared to other irrigation treatments,the W1 treatment had the highest values of starch content,wet gluten content and sedimentation value,and followed by W2,and the difference between W1 and W2 was insignificant.The W1 treatment had the highest values of spike number grains per spike,1000-grain weight and yield,and followed by W2,when compared to W0(no irrigation during the whole growth period of wheat) they were significantly increased by 3.2%,5.4%,6.1%,15.3%and 2.1%,4.3%,5.6%,10.9%,and if the irrigation amount was the same,the effects of irrigation one time on increasing yield could be better than or equivalent to irrigation two and three times.Correlation analysis showed that the total root volume, total surface area,average diameter,total root tips were all positively correlated to photosynthetic rate,canopy chlorophyll density,1000-grain weight and yield.All the findings indicated that irrigation at jointing stage and heading stage was the best for improving root traits,photosynthesis,quality and yield,and the effects of the increasing of irrigation times was not obvious under the same irrigation amount.

Key words: Root traits, Chlorophyll density, Photosynthesis, Quality, Yield

CLC Number: 

• S152.01

• S512.07