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用7个水稻品系分别与籼、粳测验品种测交,配组合60个。结果表明:“11509”与籼型测验品种的杂种F_1结实率均值为77.0%,与粳型测验品种的杂种F_1结实率均值为74.6%,其结实率不受品种的影响,具有广谱广亲和性。 相似文献
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穭稻的植株形态及谷粒特性与云南稻的两个粳型地方品种相近,彼此的杂交结实率高于它与籼型品种的杂交结实率。穭稻野生性状较强,在 F_1代中表现显性.F_1植株的花粉育性为1.15—82.1%,与粳型品种杂交时育性较高,又以穭稻为母本时育性高于其反交组合。穭稻种胚酯酶同工酶的酶带与云南稻的粳型品种有些相近。穭稻与云南稻四个品 相似文献
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籼、粳、中间型水稻杂种F1的生物优势、经济优势与RFLP的关系研究 总被引:6,自引:1,他引:5
对典型灿、粳稻南京11、金南凤突变体和中间型品种Bellemont相互杂交形成的三各上杂种优势及三者之间的RFLP进行了系统分析,结果表明:F1杂种生物学优势存在着籼/粳〉籼/中间型〉粳/中间型趋势,经济优势则为籼/中间型〉粳/中间型〉籼/粳。而多态性是籼/粳〉籼/中间型〉粳/中间型,并且各珠12条染色体我态性程度也有差异,因此,多态性与生物优势趋于一致,但经济优势却与多态性及亲和性基因有关。 相似文献
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水稻亚种间广亲和性及其酯酶同工酶特点 总被引:1,自引:0,他引:1
通过与籼粳测验种测交,考察了9个待测品种的亲和性表现。结果表明品种Dular、Aus449、0046、CPSL-17、KetanNangka、02428具有广亲和性,水源287可能具有广亲和性。比较广亲和性品种和不具有广亲和性品种的酯酶同工酶,得出所有供试广亲和品种都具有特异酶带9A,某些广亲和性品种具有酶谱的中间型特点。因此,可以将酯酶同工酶9A或中间型酶谱作为筛选广亲和性品种的一个生化指标。 相似文献
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水稻籼更杂种一代稻米加工和外观品质性状研究 总被引:1,自引:1,他引:1
采用不同稻米品质3个粳稻和4个籼稻按完全双列模型设计进行杂交,配组了24个籼粳杂种一代F1,对其主要稻米加工和外观品质性状进行了研究。加工品质中糙米率和精米率均接近粳稻品种,与籼稻无关,无胞质效应;整精米率差异很大,但大多介于籼粳双亲之间,并且随粳稻亲本不同,其胞质效应表现不一致。 相似文献
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水稻亲本遗传分化程度与籼粳杂种优势的关系 总被引:46,自引:2,他引:44
本文利用两套材料,即来自一个籼/粳交(圭630/02428)的双单倍体(DH)系和另一组由多种类型的籼、粳组成的对照组,从分子水平上研究了水稻亲本的遗传分化程度。在此基础上探讨了亲本的遗传分化程度与籼粳杂种优势的关系。两套测交F1群体的结果一致表明,亲本遗传分化程度对穗数和千粒重的影响相对较小,但是对每穗结实粒数和结实率这两项体现育性的指标影响较大。当亲本遗传分化综合指数TDj值为20 ̄25时,育 相似文献
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光温敏核不育水稻在连云港自然条件下具有明显的育性转换期,各材料出现的时间不同,中粳,中籼型发生在8月下旬至9月初,早籼、晚粳型发生在9月上、中旬、粳型育性转换比籼型迅速、彻底。各不育系对低温,日长的反应不同,其对低温的敏感期为雌雄蕊分化期至减粉分裂期。 相似文献
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An analysis of hybrid sterility in rice using a diallel cross of 21 parents involving indica, japonica and wide compatibility varieties 总被引:3,自引:0,他引:3
Summary There is much interest in the inter-varietal fertility of Asian cultivated rice. In this study, we analyzed the fertility of hybrids in a diallel set of 210 crosses involving 21 parents representing a broad range of the cultivated rice germplasm including landraces, primitive cultivars, modern elite cultivars and parents of hybrid rice. The materials were also carefully selected with respect to indica-japonica classification including typical indica/japonica, more or less intermediate and wide compatibility varieties. The level of hybrid fertility varied widely among the crosses from almost completely sterile to fully fertile. In general, hybrid fertility of intra-subspecific crosses, i.e., indica by indica (I×I) and japonica by japonica (J×J), is much higher than inter-subspecific crosses (I×J or J×I). The fertility varied widely in hybrids involving wide compatibility varieties and also in inter-subspecific crosses not involving wide compatibility varieties. An analysis of variance showed that both the main effects of indica and japonica parents and the interaction between the parents are highly significant in determining hybrid fertility. We speculate that, in addition to wide compatibility, the overall genetic difference between the indica and japonica parents, that may involve a series of minor mutations, play an important role in determining the hybrid fertility. There are also genes of sizable effect that influence fertility in hybrids resulting from specific combinations of the parents.Abbreviations I×I
indica by indica cross
- I×J
indica by japonica cross
- J×I
japonica by indica cross
- J×J
japonica by japonica cross
- WCV
wide compatibility variety 相似文献
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A genetic analysis of low-temperature-sensitive sterility in indica-japonica rice hybrids 总被引:9,自引:0,他引:9
Low-temperature-sensitive sterility has become one of the major obstacles in indica–japonica hybrid rice breeding. The objectives of this paper were to evaluate the extent of the fertility reduction and to determine the genetic basis of low-temperature-sensitive sterility. Seventeen varieties were crossed in various ways to produce 21 F1s including 16 indica-japonica hybrids. Fertility of the F1s and their parents was examined under both high and low temperature conditions. Considerable reduction in spikelet fertility was observed under low-temperature conditions in the majority of the indica–japonica hybrids having at least one wide compatibility parent. However, the extent of fertility reduction varied greatly, depending on the parental genotypes. Data from five pairs of reciprocal crosses indicated that the cytoplasm had no effect on fertility reduction. The more-or-less bimodal distribution of the fertility segregation of one BC1F1 and two F2: populations under low-temperature conditions suggested that the low-temperature-sensitive sterility was controlled by only one or a few genes. It was also shown that the low-temperature-sensitivity is not related to wide compatibility. We conclude that it is possible to develop indica-japonica hybrids with wide compatibility and also insensitivity to the low-temperature conditions. 相似文献
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水稻广亲和基因S5-n的功能标记开发及其应用 总被引:5,自引:1,他引:4
广亲和基因S5-n是能够恢复籼、粳杂种育性的基因,利用常规育种方法回交转育广亲和基因需要通过配组杂种F1,根据F1的育性判断和选择S5-n,选育周期长,方法繁琐。因此,在广亲和遗传改良和聚合育种中需要寻找一种快速、简便的广亲和基因检测方法。本研究根据水稻广亲和基因和籼粳S-5等位基因序列存在136 bp缺失的特征,设计了InDel标记S5136。前人研究已经明确02428、Dualr、CPSLO17具有S5-n,分子标记S5136 PCR扩增这3个材料的带型为缺失带型,而不携带广亲和基因S5-n的材料的带型为非缺失带型。利用该标记对3037与02428的F2群体分析表明,该标记能准确区分S5-n、S5-i纯合及杂合基因型,标记基因型符合1∶2∶1比例,没有发生偏分离现象。利用该标记从554份水稻品种资源(O. sativa L.)和27份普通野生稻(O. rufipogen Griff.)以及24份江淮流域杂草稻资源中筛选出具有缺失带型的资源材料13份,并对其PCR产物测序证实为S5-n,对Kasalath的广亲和性进行了初步验证;从20份02428的高世代育种材料中,筛选到携带广亲和基因S5-n的恢复系2份。该标记可以用于S5-n基因资源筛选、分子标记辅助选择育种和培矮64S为母本的杂交种种子纯度鉴定。 相似文献
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云南是世界公认的亚洲栽培稻遗传多样性和起源中心之一。利用51对SSR分子标记对云南哈尼梯田当前栽培的111份水稻材料进行多态性检测,并分析其群体结构。聚类分析表明,供试材料主要分为偏粳类群(group I)及偏籼类群(group II)两大类群,其中以偏籼类群居多,占83%,这两类群并未完全按地理来源聚类。所选材料稻米的糊化温度变异较广,可以分为低(66℃)、中低(66~70℃)、中高(70~74℃)和高(74℃)4类。通过基因测序,分析了稻米糊化温度控制基因ALK的序列多样性,发现其可以分为10种单倍型。关联分析结果表明,所选水稻样品稻米的糊化温度主要由ALK基因3个SNP位点组合控制。其中,A-GC和G-TT两种组合主要控制低(66℃)和中低(66~70℃)糊化温度,G-GC组合主要控制中高(70~74℃)和高(74℃)糊化温度。SNP3402 T类型与高、中高糊化温度有关。绝大多数偏籼类品种的ALK基因含有G-GC组合,因此都倾向于高糊化温度。上述研究结果为水稻分子育种和种质资源保护研究提供了一定的参考价值。 相似文献
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利用光温敏两用核不育系广占63S分别和籼粳型父本测交配组,通过对两种类型F1代的产量性状表现的比较,对两种组配方式32个F1组合的单株产量与产量性状的关系进行相关分析,并对产量性状对单株产量进行了通径分析。结果表明,广占63S与籼型父本配制的组合在结实率和千粒重上优势明显,其单株穗数和单株产量呈极显著正相关,结实率和单株产量呈显著正相关;粳型父本配制组合的结实率和单株产量呈极显著正相关,每穗粒数和单株产量呈显著正相关。两种组配方式后代组合产量性状对单株产量的直接作用也不相同,进而提出了利用广占63S与籼型材料配组比直接利用粳型材料配组更有利于选育出强优势实用型杂交组合。 相似文献