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leaf stalk 【植物;植物學】葉柄。

leaf valve

The materials as explant in transformation come from birch leaf , stem segment and leaf stalk , and the spider toxin gene was used as foreign gene for this transformation experiment . it showed that the best explant was the big leaf , on which the transformation frequency was 22 % . by gus detection , there were 43 percent of the plants with kanamycin resistance , and 100 percent of positive result , by pcr amplification , was gotten from random sampling 利用雙元載體的根癌農桿菌lba4404菌株( agrobacteriumtumefaciens ) ,含質粒pyhy (目的基因及npt 、 gus基因) ,對白樺試管苗莖段,葉柄,葉片三種外植體進行侵染,結果表明:大葉片生長勢強,為轉基因的最優外植體,轉化率能夠達到22 。

Above the skeleton of a fallen leaf stalks the dark shape of a spider out hunting for springtail or mite or whatever tiny invertebrate strays its way 在一片落葉的葉脈上,潛伏著一只蜘蛛的黑影,它正準備獵捕彈尾蟲、螨蟲,或是任何一種迷路的微小的無脊椎動物。

Mulberry , multi _ petalled ; upright flowers with black _ purple base , flat round buds , medium _ sized narrow leaves in dark green , stiff , slanting leaf stalks 深紫紅色,臺閣型。瓣基黑紫,花朵直上,花蕾圓尖。葉中長尖,深綠色。葉柄硬,斜生。株型直立。