Superior japonica rice variety YJ144 with improved rice blast resistance,yield, and quality achieved using molecular design and multiple breeding strategies

Molecular Breeding - The stem color of young mung bean is a very useful tool in germplasm identification. Flowering time and plant height (PH) are known to be strongly correlated with crop adaption...     

Mapping of qGL7-2,a grain length QTL on chromosome 7 of rice

A residual heterozygous line(RHL)carrying a heterozygous segment between two SSR loci RM11 and RM134 on the rice chromosome 7 was selected from a set of recombinant inbred lines from the cross D50(javanica)/HB277(indica).The former parent produces much longer grains than the latter.Selfed progenies of this selection were analyzed genotypically(SSRs)and phenotypically(grain length).Grain length was discontinuously variable in the mapping populations,allowing for the placement of this QTL qGL7-2 within a～4.8 cM interval defined by RM351 and RM234.A set of new markers within this region were developed,which narrowed the QTL to a 278 kb region defined by the markers Indel1 and RM21945.This region contains 49 predicted genes.The results also suggest that the novel allele for grain length will be used for the application of marker assisted selection for the improvement of grain length.     

The involvement of long non-coding RNAs in the formation of high temperature-induced grain chalkiness in rice

A period of exposure to high ambient temperatures can damage the process of grain filling in rice, potentially inducing the endosperm to become chalky. Given the established involvement of long non-coding RNAs (lncRNAs) in regulating plant development and its stress response, the purpose here was to reveal the extent to which lncRNA activity contributes to the endosperm chalkiness syndrome. Among 578 lncRNAs identified in spikelets harvested ten days after fertilization from plants exposed to high temperature stress, 14 were found to be significantly up-regulated expressed than in control plants, while 45 were significantly down-regulated expressed. Of these 59 differentially expressed lncRNAs, 32 were predicted as interacting with five mRNAs involved in starch metabolism and catabolism, indicating an involvement of these lncRNAs in starch formation in the endosperm, and hence in causing the chalkiness syndrome.     

鲁西南甘薯天蛾发生规律及防治研究

甘薯天蛾在鲁西南一年发生３－４代,以蛹在土中７－１５ｃｍ深处越冬。各代幼虫发生期：第１代发生在５月下旬至６月下旬,第２代于７月上旬至下旬,第３代８月上旬至９月上旬,而第４代则于９月上旬至１０月下旬。发育起点温度１５．６±１．３℃,有效积温３７０．６±１３日度。温度、天敌、降水是影响此虫发生的重要因素。采用高效低毒农药、点灯诱杀、保护利用天敌等措施综合防治甘薯天蛾,有较好的防治效果。