子叶的

The high frequency plant regeneration system of Medicago truncatula with cotyledonary-node explants was developed through direct shoot organogenesis.

通过直接的芽器官发生途径，建立了蒺藜苜蓿Medicago truncatula子叶节外植体的高频植株再生体系。

The cellular structure, chemical characterization of foliar endodermis and element cellular distribution were investigated in Pinus bungeana leaves by the fluorescence microscope, Fourier transform infrared microspectroscopy and energy-dispersive X-ray analysis.

应用荧光显微技术、傅里叶变换显微红外光谱分析、扫描电镜及X-射线能谱微区分析等手段，对白皮松子叶、初生叶及2 a生针叶内皮层细胞径向壁的显微结构特征、化学成分，以及在叶子横切面上Na和Cl的微区分布进行分析。

Tests showed that the resistance of cucumber leaves to low temperature photoinhibition increased after cold acclimation.

经叶绿素a荧光测定也证实，低温适应后PSⅡ的荧光化学效率仍较高，同时，黄瓜子叶对低温光抑制的抗性提高。

Results showed that the frequencies of shoot regeneration of cotyledons explants from 4 d old in vitro grown seedlings were markedly increased from 34% to 46% via a preculture procedure of 2 days period using the media containing the hormone combinations of 2,4 D 0.5-1.2 g/L and 6 BA 0.2 mg/L.

结果表明，苗龄4d的幼苗子叶于含2，4－D0.5－1.2mg／L和6－BA0.2mg／L的培养基培养2或6d后再转到分化培养基上培养，芽再生率提高34％－46％。

The embryo consists of a hypocotyls-root axis, with a rootcap and apical meristem at one end and an apical meristem and several cotyledons, or seed leaves, at the other.

胚胎有胚桥-根轴，藉由 rootcap 和顶上的分裂组织在一端和一个顶上的分裂组织和一些子叶或种子树叶，在另一个。

Salicornia europaea is a dicot halophyte,which could grow in marsh with salinities greater than 3.5%and the major osmotica in its fleshy stems was Na~+ and g lycine betaine.

盐角草是一种双子叶盐生植物，可在含盐3.5%以上的湿地正常生长，其体内主要的渗透调节物质是Na~+和甘氨酸甜菜碱。

The embryogenic cell first divided into multicellular proembryos,then globular embryoid,pearshaped embryoid,long embryoid,scutiform embryoid and mature embryoid.

胚性细胞继续分裂形成多细胞原胚，经球形胚、梨形胚、长形胚、子叶分化期到成熟胚，其发生的胚状体与单子叶合子胚形成具有相似的过程。

Seed 1; cotyledons unequal, 1 large, starchy, retained in fruit, 1 small, scalelike, germinating from fruit apex, through pore of stylar canal; endosperm absent.

种子1；子叶不均匀的，1个大，粉状的，保留在果里面，一个小，鳞片状从果实顶部发芽，横穿花柱道孔；无胚乳。

In order to explain clearly the variation status of embryo from tetrapoid Robinia pseudoacacia and fully use the variation resource initiated in the sexual reproduction of TRP in the further improvement of TRP, the classification and vitalities of seed embryos from tetraploid Robinia pseudoacacia were studied. The main results are as follow. According to the cotyledon number, color and plumpness, the seed embryos of TRP could be divided into 5 types: YVT (yellow, very replete,2 cotyledons), YMT( yellow, more replete,3 cotyledons ), YRF ( yellow, replete,4 cotyledons ), GNT ( green, no-replete, 2 cotyledons ) and WNT ( white, no-replete, 2 cotyledons ).

为了阐明刺槐同源四倍体种子胚变异状况及充分利用刺槐同源四倍体有性过程创造的变异资源对四倍体刺槐进行遗传改良，研究了刺槐同源四倍体种子胚类型及其生活力特征，主要结论如下：刺槐同源四倍体种子胚按照子叶数量、颜色及饱满程度，可以划分出5个类型：黄二、黄三、黄四、绿二及白二，所有类型种子胚混合平均单胚重量接近二倍体的1/2。

Family of flowering plants having two cotyledons in the seed which usually appear at germination.

开花植物中种子有两个子叶显现在萌芽时期的一科。行为像孩提时的晚年时期；老小孩

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。