Subject:
rice phylogeny geographical distribution chromosome genomes chloroplast isozyme proteins cultivation cultivated rice wild rice ecotypes ecospecies trisomic analysis gene analysis morphological characters seeds seedlings roots culm leaves panicles spikelets dwarfism pigmentation anthocyanin physiological characters plant development dry matter yield nitrogen fixation grains disease resistance insect resistance environmental stress heterosis mutation polyploidy haploidy aneuploidy hetroploidy biotechnology genetic resources tissue culture cell fusion plant breeding DNA history preservation