共查询到20条相似文献,搜索用时 68 毫秒
1.
2.
短蔓雄性不育西瓜的研究 总被引:7,自引:0,他引:7
短蔓雄性不育西瓜初步研究表明,不育性是由1对隐性核基因控制,不育性与短蔓性相伴出现,控制短蔓性状的基因有别于目前发现的2个短蔓基因,雄性败育彻底,过氧化物同工酶及可溶性蛋白质电泳分析显示,不育株的带谱较可育株多。本文还对短蔓雄性不育西瓜的利用途径进行了探讨。 相似文献
3.
4.
5.
对在长蔓西瓜材料5-6y中发现的1株短节间突变体的研究显示,其受制于1对隐形基因。这1新的短蔓突变体(系)暂命名为d5-6y,它既不与已知的dw-1和dw-2等位,也无法与dw-3进行测定,建议将这一新的短蔓基因命名为dw-4。 相似文献
6.
7.
8.
9.
10.
以拉宾斯、胜利、红灯、友谊和奇好品种为试材,测定其花粉萌发率.结果表明,2007 ~2009年3年各品种新鲜花粉的平均萌发率为64.90%~24.85%,拉宾斯的最高,奇好的最低.阴干花粉在18℃室温下贮藏12天时拉宾斯的萌发率降至35.4%,其余4品种均降至10%以下;阴干花粉于4℃冰箱内贮存21天时拉宾斯的萌发率仍在34.6%,其他品种均接近10%,拉宾斯仍保持有贮藏前的50%以上的萌发能力. 相似文献
11.
12.
13.
西瓜成熟花粉的超微结构 总被引:1,自引:0,他引:1
为了解西瓜成熟花粉的超微结构特点,特别是营养细胞和生殖细胞之间的关系,选取刚开花的西瓜雄花采集花粉,2.5%戊二醛固定并制成超薄切片,透射电镜观察照相。结果表明,西瓜成熟花粉粒中营养细胞含丰富脂类储藏物质和内质网,内质网堆叠,周围和间隙中充满脂类物质;含丰富高尔基体和大量小泡;质体很少。营养核通常深度开裂,产生多数裂片,裂片伸向生殖细胞。生殖细胞流线型,细胞壁电子透明,细胞核伸长,细胞质含高尔基体、内质网,不含质体。生殖细胞表面产生波状突起,波峰背离营养核。生殖细胞一端伸入营养核裂片间隙,2者构成雄性生殖单位。 相似文献
14.
Papaya pollen viability and storage 总被引:2,自引:0,他引:2
Papaya pollen viability, tube growth and storage were studied. Pollen germination on a drop of modified Brewbaker medium at 22–26°C closely reflected in vivo germination. Two vital stains gave pollen viability estimates that correlated closely with pollen germination percentage. The time from pollination to first ovule penetration was 25 h at 28°C, no in vitro pollen germination was observed at 5°C and at 40°C pollen tube growth was retarded. High relative humidity (70–80%) hastened the process compared with low relative humidity (30–40%).
Pollen could be stored successfully for 6 months when kept at − 18°C in a deep-freezer. Storage of pollen for the winter months, during which no or very little viable pollen is formed in the coastal area of Israel, seems a practical means to ensure adequate fruit set. 相似文献
15.
番木瓜花粉生活力及其贮藏性研究 总被引:2,自引:0,他引:2
研究了贮藏温度对番木瓜花粉生活力的影响。结果表明:各品种新鲜花粉的生活力均较高(达70%以上),且差异不大;常温下,花粉一般可保存7d;0~5℃下干燥贮藏,可保存120d,最多不超过180d;LN2保存一年后的生活力与新鲜花粉没有显著差别。 相似文献
16.
保存温度对网纹甜瓜花粉生活力的影响 总被引:6,自引:0,他引:6
研究了网纹甜瓜花粉生活力在不同保存温度和培养温度下的变化,结果表明25-35℃培养温度范围最适合 网纹甜瓜花粉萌发,萌发下限温度为10℃,上限温度为45℃。常温(25℃)下网纹甜瓜花粉极易失去活力;5℃低温条 件下比较适合于网纹甜瓜花粉的短期保存;-20℃和-75℃低温条件下不适合网纹甜瓜花粉的保存。 相似文献
17.
18.
利用花粉粒形态分析法研究桃种质资源的进化关系 总被引:15,自引:3,他引:15
通过对桃5个野生近缘种、46份普通桃种质资源进行花粉粒电镜扫描,分析花粉粒之间形态特征的差异,研究光核桃、蟠桃、碧桃等种质资源在桃起源和演化中的地位。结果表明,光核桃花粉粒的形态呈椭圆球形,其外壁纹饰呈简单的直纹平行型,无穿孔,是最原始的桃亚属植物野生种,未发现与栽培种有直接的关系。在普通桃的地方品种中,西北油蟠桃、华北碧桃、垂枝桃、矮化桃等种质资源的花粉粒外壁纹饰均为直纹,有少量穿孔或不明显穿孔,说明蟠桃、碧桃、垂枝桃、矮化桃应属于较为原始的种质类型。供试材料的花粉粒形状以椭圆形为主,且首次发现哈太雷品种的花粉粒呈为圆球形。 相似文献
19.
不同品种兔眼越橘花粉超微结构与营养成分的观察分析 总被引:1,自引:0,他引:1
为探索越橘花粉稔性与超微结构及营养成分的关系,以灿烂、园蓝、粉蓝、杰兔和顶峰5个兔眼越橘品种的花粉为试材,运用透射电镜观察花粉结构及测定了花粉营养成分。结果表明,越橘花粉结构中,内膜系统清晰可见,发育程度因品种而异。花前的花粉细胞核仁较大,蛋白质合成旺盛。通过花粉超微结构与营养成分间关系的分析比较表明,花粉壁的厚度、花粉细胞的蛋白质含量与花粉的萌发率没有相关性。花粉细胞的全糖和脯氨酸含量与花粉发芽率有正相关趋势。内质网发育程度与蛋白质含量呈正相关趋势。 相似文献
20.
The inactivation of pollen by soft X-ray irradiation and subsequent artificial pollination are time-intensive practices used in the production of seedless watermelons (Citrullus lanatus L.). Watermelon generally has a lot of staminate flowers; however, they only have a small amount of pollen. Watermelon pollen cannot be used in pollination under the present situation. Therefore, the objective of this study was to determine which is the most effective pollen extender medium for cultivation of watermelon with soft X-ray irradiated pollen. In this experiment, ‘Agar,’ ‘Marriage powder,’ and ‘Sekishoshi’ (Lycopodium dyed red with safflower pigment) were used as extender media with soft X-ray irradiated pollen at equal or twice the weight of the pollen. When ‘Sekishoshi’ was used as an extender medium, fruit set was very low. A lot of deformed fruit was produced when agar was used with the pollen. On the other hand, when ‘Marriage powder’ was used in equal proportions with the pollen, fruit set was about 70% and, moreover, Brix was high. Thus, the mixture of ‘Marriage powder’ with an equal amount of pollen was the best for use in actual cultivation. We conclude, then, that soft X-ray irradiated pollen in an extender medium can be effectively adapted for producing seedless watermelons. 相似文献