Effect Of Saline-alkali Stress On Characteristics Of Photosynthesis And Matter Production And Yield Of Different Leaf Ages Rice

The adaptability of different leaf ages of rice is studied under saline-alkali stress, the most suitable transplanting leaf age is discussed in different concentration saline-alkali stress, its has important significance in raising the yield of rice saline-alkali land. So this experiment adopts the method of potted, takes rice variety Changbai 9 as experimental material, studying the effect of the soda saline-alkali stress on characteristics of photosynthesis and matter production,panicle traits and yield of different leaf ages rice, in order to make clear optimum planting leaf ages under saline-alkali stress, the main research results are as follows:1. The influence of saline-alkali stress on characteristics of photosynthesis and matter production of different leaf ages rice: in terms of dry matter accumulation, in S1 and S2, dry matter accumulation amount and proportion of performance between different leaf ages for L2 >L1 > L3; in S3 of L1 > L2 > L3. In terms of dry matter distribution, in S1 and S2, the dry matter weight ratio of panicle of different leaf ages at milk and maturity of L2 > L1 > L3, the dry matter weight ratio of leaf and sheath in mature period L2 was minimum; in S3, the dry matter weight ratio of panicle of different leaf ages L1 was the highest in milk stage and mature stage,the dry matter weight ratio of leaf, sheath and stems of L1 < L2 < L3 at maturity. In terms of export and transformation of dry matter, under the condition of S1 and S2, the export, export rate and transformation rate of leaf, sheath and stem with different leaf ages conversion performance for L2 > L1 > L3, under the condition of S3, the export of leaf, stem and sheath performance for L1 > L3 > L2. In terms of photosynthetic production, in S1 and S2, the leaf area index and photosynthetic potential for three leaf ages of L2> L1 > L3, in S3 of L1 > L2 >L3; The crop growth rate and net assimilation rate from tilling to jointing stage and heading to milk stage in S1 and S2 of L2 > L1 > L3, in S3 performances L1> L2 > L3, there was very significantly differences.2. The influence of saline-alkali on panicle traits and yield of different leaf ages of rice:The primary branch traits of different leaf ages for significantly difference in S2 and S3, the difference was significantly or very significantly on secondary branch traits of different leaf ages under saline-alkali stress. Showed that secondary branch traits than primary branch traits of rice more sensitive to saline-alkali stress. The yield of different leaf ages rice was L2 > L1 > L3 in S1 and S2, in S3 of L1> L2 > L3, there was significantly difference with different leaf ages;The grains of per panicle,1000-grain weight and seed setting rate of yield components in S3 ofL1 > L2 > L3, and the difference was significant; Effective panicles per pot L1 and L3 no difference, and L2 significantly greater than L1 and L3 in Ck, in S1 and S2 for L2 > L1 > L3,L2 respectively higher than L1 6.49% and 22.34%, than L3 18.69% and 35.94%, L1 respectively higher than L3 11.46% and 11.12%; In S3, L1 slightly higher than L2, and significantly higher than L3.Showed that L2 had high yield mainly by the effective panicles in S1 and S2, but in S3 four factors contribute to production of L1.To sum up, in S1 and S2, L2 leaf age transplanting adaptability was stronger, at different growth stages of dry matter accumulation of mutual coordination and photosynthetic matter more reasonable distribution in various organs, leaf area index and photosynthetic potential, was conducive to the improvement of rice yield. In S3, L1 transplanting seedling ages more reasonable, was conducive to improving yield.