杂种的

The apomictic research progress in plants is summarized, including the approaches of fixing heteroses, selecting and breeding of plant varieties and apomictic materials, embryology, genetics, apomictic characteristics and so on .

介绍了植物无融合生殖在选育无融合生殖品种及育种材料方面的成果；概述了植物无融合生殖在胚胎学、遗传学及生殖特性，杂种优势固定途径及无融合生殖材料选育途径等方面研究的现状和趋势。

Large degree of variation in growth performance and hetercsis were found among different cross combinations of 6×6 diallel cross of Pines massoniana.

马尾松6×6全双列杂交的不同组合，其11年生子代在生长性状及其杂种优势上均存在较大的差异。

Sixty-two varieties were used to analysis the heterosis of the Fl hybrids, which were created in a diallel set of cross between 9 ecological types.

利用9个不同生态类型的62份水稻亲本材料，以生态型为单位进行双列杂交，配制988个组合，研究杂种一代的对照优势和超中亲优势。

C. hytivus exhibited the typical hybrid dimeric banding pattern. The difference in band intensity between C.

新种的AAT酶谱在两个多态性位点表现了典型的杂种二聚体谱型。

In the studies on transferring and identifying alien chro-mosomes into wheat,the combined use of mitotic and meioticchromosome N-banding is also successfully practiced in deter-mination of T.durum-H.villosa amphipoid,five wheatalien disomic additions with H.villosa chromosomes,〓〓,alien sulstitution line with chromosome 〓 andsome translocation lines.

在外源染色体导入、鉴定研究中，利用根尖有丝分裂中期染色体和花粉母细胞减数分裂中期Ⅰ染色体的N-分带，快速、准确地鉴定了硬粒小麦一簇毛麦双二倍体、普通小麦一簇毛麦异耐加系V〓、V〓、V〓、V〓和V〓，普通小麦一簇毛麦异代换系V〓以及一些具有易位的杂种后代。

Mandschurica and F. vesca. To study the effect of Fragaria interspecific hybrid breeding on molecular level, the 14 accessions from interspecific hybrids of 2 crosses combinations between F. nilgerrensis and F. ananassa and 10 accessions from interspecific hybrids between F.

在杂种后代中观察到了亲本黄毛草莓、东北草莓及凤梨草莓不同栽培品种的特征带型，从而从DNA分子水平初步证实了黄毛草莓、东北草莓与凤梨草莓种间杂种的真实性。

2N gametes are the result of meiotic mutation during micro- and mega-sporogenesis that bear the sporophytic rather than the gametophytic chromosome number. This paper reviewed the genetic markers including the morphologic, cytological, isozymes and DNA markers, which have been employed in the generation, inheritance, heterozygosity and marker-assisted breeding of 2n gametes based on the frequency of large pollen grains, cytological analyses, unexpected occurrence of polyploidy progeny and the associations between parents and progenies.

文章综述了植物2n配子发生及其遗传标记研究现状，论述涉及有关形态学标记、细胞学标记、同工酶标记乃至DNA标记等遗传标记在2n配子研究中的应用，指出通过花粉形态观察、大小孢子母细胞减数分裂行为观察、杂种后代倍性鉴定以及亲子分子标记相关分析等，对2n配子发生、2n配子遗传类型与杂合性以及2n配子在育种实践中的有效性等进行研究。

Information on the combining ability and heterotic patterns of maize germplasm is of great value to maize breeders.

研究玉米种质的遗传关系及其杂种优势模式对玉米育种者有着极为重要的指导意义。

Huangzaosi inbred lines(Huangzaosi and its derived lines) is recognized as one of five heterotic groups by maize breeding in China. It has characters of high combining ability, ideal plant type, drought and barrent tolerance, wide adaptation and so on.

黄早四种群自交系是我国玉米育种的五大骨干杂种优势类群之一，建立在黄早四及其改良的衍生系基础之上，具有配合力高、株型好、耐旱耐瘠、适应性广等特点。

Heterosis is based on the heterozygosity of heterozygotic genotypes.

育种实践表明，杂种优势的遗传基础是杂交种基因型的杂合性。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。