查询词典 heterosis

So,the genetic distance could be used for the choice ofparents and for the heterosis prediction in cross breeding of Liriodendron.

因此，花粉品质、杂交亲和力和一般配合力应作为亲本选配的重要依据；基于RAPD标记的亲本间遗传距离与子代1年生苗高和地径生长量均表现为二次曲线相关，复相关系数分别为0.8235和0.5090，达极显著(H，P＜0.01)和显著(GLD，P＜0.05)程度，说明利用亲本间遗传距离进行鹅掌楸亲本选配和杂种优势预测是可行的。

Under nature pollination condition,the fruiting rate is about 2%by self-fertilization, and heterosis of character of tea plant filial generation is unavoidable due to the limitation of its self-fertility.

茶树虽然是异花授粉植物，但自花结实率一般为2%左右，要想利用杂种第一代，需要采取隔离等措施。

In Japonica heterosis utilization, the purity of hybrid seeds was sometimes low due to the self-fertility and/or unstable sterility of some BT type Japonica cytoplasmic male sterile lines. For the WA type Japonica CMS lines, their sterility is much stable, but there is also some difficult to take use of them because their flowering habit is bad and it is very difficult to restore their fertility. The HL type CMS lines were identified to have the same flowering habit and outcrossing rate with the BT type CMS lines in Japonica hybrid rice. Moreover, the sterility of HL type CMS lines was more stable than that of BT type, and their restorable characteristics was better than that of WA type.

部分BT型粳稻不育系存在自交结实现象，不育性的稳定性较差，影响杂交种的纯度；WA型粳稻不育系虽然不育性稳定，但开花习性差，育性最难恢复，应用难度较大；HL粳稻不育系开花习性及异交结实率与BT型粳稻不育系无显著差异，育性稳定性明显好于BT型粳稻不育系，可恢复性明显好于WA型粳稻不育系，较好地协调了育性稳定性、开花习性和可恢复性几方面的矛盾。

F1 hybrid has the morphological feature which is between the male and female parents and shoed strong heterosis, exuberant vitality, late ripe period and low rate of self-fertility. The average chromosome configuration of F1 in PMC MI was 18.58Ⅰ+18.59Ⅱ+0.085Ⅲ+0.028Ⅳ. At anphase Ⅰ in PMC, some laggard chromosomes arranged in equatorial plate. Micronucleus and a lot of abnormal cells can be observed at dyad, tetrad and microspore.

杂种F1形态特征介于双亲之间，具有较强的杂种优势，生长旺盛，熟期晚，自交结实率较低。F1花粉母细胞减数分裂中期Ⅰ平均染色体构型为18.58Ⅰ+18.59Ⅱ+0.085Ⅲ+0.028Ⅳ，PMC后期Ⅰ观察到部分落后染色体排列在赤道板上；二分体、四分体和小孢子时期，细胞内普遍观察到微核，且出现大量异形细胞。

Heterosis for fructan accumulation and content,tissue nitrogen accumulation and content in various growth stages of six hybrids was studied at the University of Sydeny, Plant Breeding Institute, Narrabri in 1996 season.

果糖积累的杂种优势与籽粒产量、籽粒氮产量和含量优势一般无显著相关关系；开花期和灌浆末期植株果糖含量的杂种优势正相关于籽粒产量优势，负相关于籽粒氮含量优势。

There is a distinct correlativity between zymogram distance of maize combination and seed yield heterosis, but toba...

雄性不育系与可育系的同工酶酶谱存在着明显差异，并且不育系的同工酶活性降低。

Based on the Liriodendron interspecies hybridization study by professor Ye Peizhong,according to the satisfying and exact mating system and field design,the reciprocal cross with extensive genetic background of Liriodendron tulipifera Linn., the backcross and F 1 crossing which had never been made, and the genetic analysis of heterosis of the hybrid tulip tree were carried out.

在叶培忠先生的鹅掌楸属种间杂交育种研究基础上按遗传设计与环境设计开展了扩大北美鹅掌楸遗传基础条件下的正反交以及前人从未做过的回交和F1 间杂交，并进行了杂种马褂木杂种优势的遗传分析。

Unstableness in the seed setting and filling is a major constraint in utilizing the heterosis of two-line intersubspecific hybrid rice.

结实率低而不稳是两系亚种间杂交稻杂种优势利用的一个主要障碍。

Both yield and quality of common maize grains are improved by crossing high oil maize as male parent and common maize as female parent due to maize heterosis and xenia.

本文利用高油玉米的花粉直感效应及与普通玉米杂交的杂种优势效应，通过高油玉米与普通玉米杂交改善普通玉米的产量和品质。

Antheraea pernyi ; genetics ; breeding ; heterosis ; molecular marker

柞蚕；遗传；育种；杂种优势；分子标记

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。