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The recessive gene na results in peas with extremely short internodes(phenotype nana). In intact plants, na prevents expression ofthe Le/le gene pair which determine the tall/dwarf difference.na blocks a step early in the gibberellin biosynthetic pathwaywhile le prevents conversion of gibberellin A20 to GA1. Whengrafted to leafy Na stocks, le na and Le na scions become phenotypicallydwarf and tall, respectively. Hence, Na stocks provide a graft-transmissiblesubstance which promotes elongation of na scions and allowsexpression of the Le/le difference. Pisum, internode length, grafting, genotype 相似文献
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