共查询到19条相似文献,搜索用时 46 毫秒
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利用爪哇稻NS2098与籼稻桂农占杂交并自交获得的F2群体,对水稻落粒性进行了遗传分析和基因定位。结果表明,难落粒性状受1对显性基因Sh(t)控制。利用分子标记将sh(t)定位在第1号染色体的SSR标记RM11869、RM3825、RM11875、RM8278、RM315、RM11893和RM1387附近,与它们之间的遗传距离分别是1.65,1.59,1.46,1.65,1.72,1.72和4.13 cM,与落粒性基因qSH1的1个SNP临近。序列分析表明,NS2098在该SNP位点为碱基T,而桂农占为碱基G,与qSH1基因的报道结果一致,推测Sh(t)与qSH1可能是同一基因。 相似文献
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落粒性是影响裸燕麦产量与品质的关键性状。本研究对228份具有代表性的裸燕麦材料的落粒性及小花的形态等15个性状进行田间多点鉴定,并建立了裸燕麦小花形态表型的鉴定方法。结果表明,15个性状在3个试验地点之间均表现出了不同程度的差异;裸燕麦的落粒性同内稃宽度(相关系数r=-0.36)、内稃面积(r=-0.30)、外稃宽度(r=-0.26)等9个性状呈显著或极显著负相关,与种子同内稃宽度的比值(r=0.37)及种子同外稃宽度的比值(r=0.20)呈极显著正相关,说明内外稃的宽度影响小花中种子的包裹程度,外稃厚度影响小花抵抗外力的能力,从而影响裸燕麦的落粒性。K-means聚类分析将参试材料分为两大类,Ⅰ类占整个群体的48%(110个),内稃和外稃整体上更加窄小,落粒性较高;Ⅱ类占群体的52%(118个),内稃和外稃整体上更加宽大,落粒性较低。对3个地点参试材料落粒性的密度分布进行了分析,提出了裸燕麦落粒性评价的等级划分标准:0~0.03为低落粒性,0.03~0.08为中落粒性,0.08~0.16为较高落粒性,0.16~0.23为高落粒性,大于0.23为极高落粒性。 相似文献
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2003年晚稻在荔浦县进行的试验结果表明,在早稻收割后第5天(即再生稻和落粒谷苗已长出)喷施农民乐747,喷药后间隔6~7 h回水抛秧,或收割早稻后当天每公顷施750 kg碳酸氢铵和375 kg钙镁磷肥封杀再生稻和落粒谷并作基肥,第2天回水泡田,第5天抛秧,这2个处理对再生稻和落粒谷苗有较显著的防除效果,并取得较好的产量。早稻收割后第5天喷药,当天回水抛秧处理每公顷产量6 570 kg,比收割早稻后当天喷药,第2天回水,第5天排浅水抛秧处理增产697.5 kg/hm2,增长11.88%。 相似文献
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落粒性是牧草种子生产中的关键制约因素,通常造成无芒雀麦(Bromue inermis)、冰草(Agropyron cristatum)、老芒麦(Elymus sibiricus)、高羊茅(Festuca arundinacea)、草地早熟禾(Poa pretensis)、路氏臂形草(Brachiaria ruziziensis)等优良牧草种子严重减产。本文重点阐述了种子生产中影响落粒性的因素,种子落粒性对种子生产的影响,相关减少种子落粒性的研究进展及措施,为今后在生产中降低牧草种子落粒性提供参考。 相似文献
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水稻强、弱势粒灌浆差异的激素调控机理研究进展 总被引:4,自引:0,他引:4
水稻弱势粒充实差不仅影响产量和品质,而且还限制了对水分和养分的高效利用。本文概述了脱落酸、乙烯、细胞分裂素、吲哚乙酸、赤霉素、多胺和油菜素类固醇等植物激素对籽粒灌浆的调控作用,比较分析了强、弱势粒内源激素的差异;从激素时空分布对籽粒灌浆的调控作用、激素对蔗糖-淀粉代谢途径关键酶活性的调控、激素对环境的响应及其栽培调控途径等方面提出了水稻籽粒灌浆激素调控机理的研究展望。 相似文献
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SHENSheng-quan CHENSheng-guang WUDian-xing XIAYing-wu SHUQing-yao 《水稻科学》2004,11(4):222-224
The newly developed hybrid rice combination "Xieyou 9308" (Xieqingzao A/T9308) has been regarded as a super-high-yielding rice variety, of which the yield potential reached as high as 12 t/ha. However, its high shattering characteristic (as high as 60%) has limited its wider application. In the current experiment, a non-shattering mutant line, M9308, was developed from T9308 by gamma irradiation. Comparisons were made but no marked differences were found between T9308 and M9308 as well as between their F1 hybrids crossed to Xieqingzao A for major agronomic and grain quality characters as well as resistance to diseases. Genetic analysis indicated that the non-shattering character of M9308 was governed by a single recessive gene. 相似文献
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sh4和qSH1基因是水稻的主效落粒基因,本研究旨在测定雷州杂草稻的sh4和qSH1的基因型,为雷州杂草稻的落粒机制研究提供分子基础。本研究从雷州10个杂草稻群体采集了100个单株及10份栽培稻种子,观测其颖壳颜色、果皮颜色和芒及落粒率,并对sh4和qSH1的功能SNP位点进行PCR扩增及序列分析。结果表明,57份杂草稻的sh4功能SNP位点为野生落粒型(G),15份为杂合型G/T,28份为突变难落粒型(T)。其中,G型和G/T型的72份杂草稻的落粒率都极高(95%~100%),而28份T型杂草稻中,19份为中度落粒(30%~75%),5份杂草稻的落粒率很高(>95%),4份杂草稻的落粒率小于30%。100份杂草稻和10份栽培稻的qSH1功能SNP位点均为G。结合落粒表型及基因型,推测sh4是调控雷州杂草稻落粒性的一个主要基因。 相似文献
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Breaking Strength of Pedicel and Grain Shattering Habit in Two Species of Buckwheat (Fagopyrum spp.)
《Plant Production Science》2013,16(1):62-66
AbstractThe grain shattering habit was examined in nine common buckwheat cultivars/strains (Fagopyrum esculentum Moench.) and four tartary buckwheat strains (F. tataricum Gaertner). As indices of grain shattering habit, the breaking bending strength and breaking tensile strength of the pedicel and the pedicel diameter were measured. Thin longitudinal pedicel sections were also observed. The breaking strength showed significant differences among cultivars, but the stage of seed maturity influenced the grain shattering habit. The two breaking strengths were larger in common buckwheat than in tartary buckwheat, and these differences may be explained by the pedicel diameter. The abscission layer was not observed in the pedicel tissue of the buckwheat cultivars. 相似文献
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