leaf senescence中文是什么意思

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中文翻译
造句

叶的衰老

leaf n. 〔英军俚〕休假。
senescence 变老; 老年期; 老朽; 衰老；老化; 衰老学; 衷老
biology of senescence 衰老生物学
causes of senescence 衰老学说
cell senescence 细胞衰老
dental senescence 齿衰,牙齿衰老
end senescence 终端衰老期
escaped senescence 逃避衰老
onset of senescence 衰老的开始
organ senescence 脏器老化
ovarian senescence 卵巢衰老
prevent senescence 延缓衰老
psychic senescence 精神衰老
racial senescence 种族衰老
replicative senescence 性衰老
senescence form 衰老形
senescence lake 衰老湖
senescence of leaves 叶的衰老
senescence phase 衰老期；老年早期；开始老年期
species senescence 种的老化
varietal senescence 品种衰老
senescence-associated gene 衰老相关基因
tonifying spleen against senescence 健脾抗老
leaf n. (pl. leaves) 1.叶；〔集合词〕叶子；茶叶，烟叶。 2.花瓣。 3.(书刊等的)一张(两面)。 4.金属薄片，箔。 5.【建筑】叶饰。 6.(门等的)页扇。 7.(可折叠的)活动桌面；(办公桌等的)桌盖。 8.(飞机的)天窗。 9.(步枪的)瞄准尺；【机械工程】小轮齿。 10.〔英方〕帽边。 11.(汽车等片弹簧的)簧片。 shed leaves (树)落叶。 a rose leaf 一片玫瑰花花瓣。 come into leaf 长叶，发芽。 in leaf 生叶子的，叶茂盛的。 leaves without figs 空谈，口惠而实不至。 take a leaf out of sb.'s book 模仿某人。 the fall of the leaf 落叶时；秋天。 turn over a new leaf 翻开新的一页；革面洗心，过新生活。 vi. 1.生叶，长叶。 2.〔美国〕翻书页。 The trees are beginning to leaf out. 树木正在开始长叶。 leaf through a book 把书翻阅一遍。 vt. 翻…的书页。 adj. -ed 有叶的。 adj. -less 无叶的。 n. 〔英军俚〕休假。
the leaf 叶的感悟

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例句与用法

Effect of nitrogen application on flag leaf senescence and yield of spring wheat
氮素施用方式对春小麦花后叶片衰老与产量的影响
Effect of n application rates on leaf senescence and its mechanism in maize was studied by methods of field experiment , plant analysis and electron microscopy examination
采用田间试验、植株分析及电镜检测方法研究了氮肥用量对玉米叶片衰老的影响及其机制。
The results showed that both inadequate and excessive nitrogen application accelerated the decreasing process of leaf area index ( lai ) and chlorophyll content at later growth stage , which led to earlier leaf senescence
结果表明，氮肥用量不足或过量均加速了生长后期叶面积系数及穗叶叶绿素含量的下降进程，使叶片提早衰老，但二者作用机制不同。
This paper reviewed the application of transgenic technique to tomatoes , introduced transgenic tomatoes with characters of delayed fruit and leaf senescence , disease and insect resistance , herbicide resistance , adversity resistan ce and good fruit quality
综述了转基因技术在培育延熟番茄、抗病虫番茄、抗除草剂番茄、抗逆番茄、改进番茄品质和延缓叶衰老番茄等方面的研究进展。
Large - scale hydrolysis of proteins occurs early in leaf senescence and is likely to dependent on the integrated action of groups of enzymes . the substrate for proteases in senescing leaves includes mainly enzymes and membrane proteins that function in photo synthesis
类囊体膜上结合的蛋白酶主要分为需能蛋白酶和不需能蛋白酶，参与类囊体膜蛋白和类囊体腔蛋白成熟时的加工以及外因导致蛋白质功能丧失时的降解。
When inadequate n was added , the chloroplast structure in mesophyll cell was damaged in ear leaf , the amount of carbohydrate decreased in mestome sheath , and excessive n - redistribution and n - transportation to grain from vegetative mass appeared , which resulted in earlier leaf senescence . excessive n application led to too high activity of nitrate reductase , excessive vigorous nitrogen metabolism and too much exhaustion of carbohydrate in ear leaf , which resulted in the lack of enough carbohydrate in the lower leaf , meanwhile , the expansive chloroplast grana lamellae in leaf mesophyll cell and starch grain without nuclear in mestome sheath cell was observed , which led to the decrease of chlorophyll content and photosythetic capacity in maize leaf , then the early senescence occured
氮肥用量不足导致穗叶叶肉细胞叶绿体结构性差，维管束鞘细胞碳水化合物累积减少,营养体氮素再分配率大而引起叶片早衰；而过量供氮则导致生长后期硝酸还原酶活性过高，氮素代谢过旺，消耗了大量碳水化合物，以致下位叶不能得到充足的碳水化合物供应而提早脱落，同时叶肉细胞叶绿体片层结构膨胀，呈“肉汁化”特征，维管束鞘细胞淀粉粒大量消耗，无核淀粉粒出现，从而叶片叶绿素含量下降，光合能力降低而出现早衰。