bract是什么意思

用法例句

Longitudinal and transverse sections of different parts of involucral bract Helichrysum bracteatum(Vent.

运用形态解剖学的方法对蜡菊总苞苞片的不同部位做横、纵切片,用HCl-间苯三酚染色进行细胞壁成分定性研究。

Five concentrations of colchicines were used to treat aerial bulbil in garlic inflorescence for polyploid induction in vitro.

用5种不同浓度的秋水仙素处理大蒜花苞气生鳞茎进行多倍体诱导,发现在固体培养基上接种处理时毒害作用较小,四倍体的诱导率最高能达到66。

Progress in Research of the ear and the Husk Development in Maize;

玉米雌穗与苞叶发育研究进展

Senescence physiological characteristics of husk of two maize genotypes;

两种基因型玉米苞叶的衰老生理特性

There existed remarkable interdependencies between contents of endogenous phytohormones and empty shell chestnut.

内源激素的含量与板栗空苞有显著的相关性,正常板栗GA1+3值花后一直上升至25 d出现明显峰值,且在花后10 d至25d增加非常明显,空苞板栗GA1+3值没有明显增长,花后GA1+3含量快速上升并达到一定的值有利于板栗胚胎的正常生长。

Some main research progress on empty shell formation mechanism of Chinese chestnut is reviewed, especially in the respect of fertilization, pollination, embryology, nutrition and ovary developmental physiology.

从授粉受精作用、胚胎发育过程、树体营养供应和子房发育生理等方面评述了中国板栗空苞形成机理的研究进展，并对当前提高板栗单产的主要研究方向进行了讨

The results of this study indicated that the water uptake speed of glumes treated with 300 ml/L acetone for 20 min, 200 g/kg NaOH for 20 min respectively, were much higher than untreated seeds.

休眠种子的扫描电镜照片显示颖苞表面致密光滑,颖孔被颖盖所覆盖,造成种子萌发过程水分难以透过。