The Effect Of Erect Panicle Gene QPE9-1in Rice Population Productivity

Erect panicle rice varieties are a very important type of rice in high yielding varieties recent years, the position can not be ignored in rice production of China. Panicle erectness gene qPE9-1is a major gene by mapping and cloning recently, it also present in many high-yielding erect panicle jiaponica rice varieties. Panicle erectness gene qPE9-1although has had a more thorough analysis on the genetics and molecular biology, but the study of system analyzes crop science is still not fully, system analysis qPE9-1/qpe9-1’s role of yield formation and group development etc. in groups has not yet been carried out. In this study, we use erect panicle japonica rice Wuyunjing8(qpe9-1) and drooping panicle biogenic lines, indica rice R6547(qPE9-1)and erect panicle isogenic lines as materials, through fertilizer and density treatments to establish groups of different sizes, research the influence of panicle erectness gene qPE9-1/qpe9-1on population development, plant morphology, population productivity and quality of rice, to systematic reviews the effects of genes in crop science.The main results are as follows:1. Erect panicle genotypes rice (qpe9-1) do not have the advantage of yield under the conditions of small groups in the low fertilizer and low density, but when the groups increase to a certain extent, erect panicle genotypes rice gradually show increase efficiency in yield, it showed a significant yield advantage especially in high fertilizer and high density conditions. Erect panicle genotype’s1000-grain weight was significantly lower than drooping panicle genotypes, the number of spikelet per panicle and filled-grain rate between different spike materials has no significant difference. Erect panicle genotypes rice showed greater than or equal to the drooping panicle genotype rice on panicles. The allele qPE9-1which from drooping panicle variety had positive effect on1000-grain weight, but had negative effect on panicle.2. The total heading material production and material production capacity of erect panicle qPE9-1genotypes rice close to or higher than the drooping panicle genotype rice. Material production in solid stage of erect panicle genotypes in the small density fewer than drooping panicle genotype, but in the high density erect panicle genotypes has obvious advantages. Economic coefficient between groups of two spike-type rice in the low density has no difference, when the density increases to a certain extent, erect panicle genotypes significantly higher than drooping panicle genotype. The two economic coefficients at higher density decreased significantly, but drooping panicle genotype reduced the large range, the density dropped significantly is lower.3. Drooping panicle qPE9-1genotype rice was significantly increased plant height in rice, length of peduncle and length ratio of total. Spike curvature and length of erect panicle qpe9-1genotypes rice substantially smaller than drooping panicle qPE9-1genotype rice. The length, angle of the three-leaf at the top was also significantly smaller, but increase in leaf width. There were no differences in number of primary branch and secondary branch between the two panicle rice. It can be seen the loss-of function of qPE9-1gene in addition to rice upright, there are also help to change the plant type, thus impact the internal structure of the group.4. Erect panicle gene qpe9-1in rice changed tillering ability; erect panicle genotypes rice had stronger tillering ability in the high density. Erect panicle genotypes was lower than drooping panicle genotype in spike rate, and spike rate of erect panicle genotypes had little response on density, while the drooping panicle genotype rice in the high density has decreased. Transmission rate, the rate of photosynthesis in group of erect panicle genotypes were better, leaf area index and chlorophyll content showed more in erect panicle genotypes, decay rate of leaf area has the opposite trend.5. N rates of rice stem, leaf and spike departments, K rates of rice spike departments in heading of erect panicle qpe9-1genotypes were significantly higher than those in drooping panicle qPE9-1genotype, it showed that erect panicle genotypes has higher absorption of nitrogen and potassium before heading than drooping panicle genotypes. At maturity, erect panicle genotypes spike has higher N, P, K percentages. it showed erect panicle genotypes has better ability of accumulate nutrients in spike.6. The brown rice, head milled rice of erect panicle genotypes were lower than those of drooping panicle genotype, there were no differences in protein content between the two panicle rice. Erect panicle genotypes had lower amylose content than drooping panicle genotype, gel consistency has the opposite trend. The kernel length, width, projected area, length/width of drooping panicle genotype were larger, percentage of chalky and chalkiness increase, the proportion of chalky Decrease. It showed erect panicle gene qpe9-1import could reduce rice processing quality, appearance improved appearance quality, cooking and eating quality.