The dynamic changes of morphological characteristics,leaf emergence rates and functional period of leaves of two compact maize cultivars,Zhengdan 958 and Zhengdan 18,and two intermediate-type maize cultivars,Zhongdan 9409 and Nongda 108 were studied under different planting density.

The results showed that there was not a significant difference between early maturing hybrids and late maturing ones in leafing rate,young panicle differentiation duration(from young panicle initiation to heading) and young panicle differentiating rate,and grain filling duration(from head.

Quantitative trait loci (QTLs) affecting total leaf number of the main stem, leafing rate at two different growth stages, heading date, and plant height in a recombinant inbred lines (RIL)population from the cross Lemont (japonica)×Teqing (indica) were investigated using a complete RFLP map with 182 marker loci.

The leafing rate of fourteen cultivars were estimated based on the interval sowing experiments and the rapid leafing genotype at the vegetative growth stage in an indica cultivar Yanhui 559 was discovered.

Relationship between meteorological factors and leaf growth speed of main stem at the different growth stages in rice;