共查询到19条相似文献,搜索用时 531 毫秒
1.
2.
3.
4.
5.
6.
7.
水分胁迫对荔枝幼树根系与梢生长的影响 总被引:7,自引:0,他引:7
以盆栽沙培1年生荔枝空中压条苗为试材,研究了水分胁迫对荔枝幼树根系和梢生长的影响以及二者的相互关系。3个处理为:沙体积含水量为7.5%(严重缺水),15.0%(一般缺水),22.5%(充分供水)。结果表明:水分胁迫严重抑制荔枝幼树地上部分和各级侧根的生长,使地上部枝梢生长严重受阻,叶片数量、平均叶面积、叶片厚度均显著变小;根总干重、侧根长度、根表面积显著减少。水分胁迫下促进须根的生长,须根的长度、根表面积比水分充足时显著增加。水分胁迫时叶片淀粉含量下降,而根系积累更多的淀粉。比较不同处理的根梢比发现,干旱对根系生长的抑制作用比枝梢更显著。 相似文献
8.
9.
10.
白露香是河北省农林科学院昌黎果树研究所从兴隆县板栗实生大树中选育出的早熟板栗新品种。坚果椭圆形,果皮紫褐色,果面油亮,茸毛少,筋线不明显,底座大小中等,整齐度高;果肉淡黄色,质地细糯,风味香甜;平均单粒质量10.5 g,每苞平均含坚果2.4粒,出实率38.1%;水分含量(w,后同)49.5%,可溶性糖含量23.3%,淀粉含量51.9%,蛋白质含量4.23%,维生素C含量27.3 mg·100 g-1。该品种在河北省燕山地区9月上旬成熟。生长势强,结果枝健壮,平均长度47.84 cm,每果枝平均着生刺苞2.16个。适应性强,耐瘠薄,抗旱性、抗寒性和耐贮性强,高抗栗疫病,抗栗红蜘蛛和桃蛀螟。适宜在河北省板栗栽培区及相似区域的山地、丘陵、河滩沙地栽培。 相似文献
11.
12.
13.
14.
高淀粉马铃薯新品种垦薯2号的选育 总被引:1,自引:0,他引:1
以高产、抗病、高淀粉为育种目标,选用俄罗斯引进的马铃薯品系гибрид82作母本、俄罗斯品种Журавинка作父本,通过有性杂交,系统选育法育出高产、抗病、高淀粉品种垦薯2号。为中晚熟淀粉加工型品种,干物质含量25.71%~29.51%,淀粉含量19.71%~23.51%,VC含量49.3mg·kg~(-1),还原糖含量0.07%。平均产量为34338kg·hm~(-2),田间对晚疫病的抗性强于对照克新12号,高抗PVX,抗PVY,适宜黑龙江省各积温带种植。 相似文献
15.
16.
17.
S. Pereira-Lorenzo A.M. Ramos-Cabrer M.B. Díaz-Hernández M. Ciordia-Ara D. Ríos-Mesa 《Scientia Horticulturae》2006
Chestnut cultivation and production in Spain has employed grafted seedlings from selected local cultivars. Previously, we have characterised the Spanish cultivars by morphological and molecular markers. We are presenting in this paper the proximate analysis and mineral content for the main Spanish cultivars. A total of 131 samples were collected from 47 cultivars in six important Spanish chestnut production regions; located in the North such as Asturias, Castilla-León (El Bierzo) and Galicia; in the Central such as Extremadura and in the South such as Andalucía; as well as the Canary Islands, the southermost part of Spain near to North Africa. High variability in chemical composition between cultivars and regions corresponded to the high genetic variability between cultivars. Correlations with environmental parameters were low, indicating that differences found between regions were probably reflecting the differences between cultivars. In Central and Southern Spain, some cultivars presented lowest moisture content due to the low summer rainfall in these regions. Differences in starch and total sugar contents were high and were negatively correlated with each other. There was no negative correlation between nut size and total sugar content. Lowest values of fibre content and ease of digestibility were found in cultivars from Galicia and Extremadura. No significant differences in Fe, Zn and Cu were found although Zn content is twice the value reported for European chestnuts. This work would be a valuable reference to chestnut quality for the food processing industry, nutritionists, breeders and growers alike. 相似文献
18.
不同菌剂对丰香组培苗生长发育和白粉病抗性的影响 总被引:3,自引:0,他引:3
以丰香草莓微繁殖苗为试材,分别以重茬土和混合基质为栽培基质,比较研究了丛枝菌根真菌(AMF)菌剂、木霉(Trichoderma)菌剂和有效微生物群(EM)菌剂对草莓植株生长发育和生理生化指标、产量、白粉病抗性等的影响。结果表明,无论是重茬土还是混合基质,供试的3种微生物菌剂处理后均可促进丰香草莓微繁殖苗的生长势,提高草莓叶片叶绿素、蛋白质、可溶性糖和淀粉质量分数,增加果实产量,其中AMF菌剂处理的效果显著,其叶面积和叶片叶绿素质量分数均是CK的1.5倍左右,产量比CK增加68.6%(重茬土)、39.5%(混合基质)。AMF菌剂处理和木霉菌剂处理植株中β-1,3-葡聚糖酶的活性是CK植株的2.6~5.5倍。在提高草莓微繁殖苗白粉病抗性上,木霉菌剂处理的效果最为显著,在重茬土和混合基质上,木霉菌剂处理植株的病情指数分别为36.7和19.2,分别为CK植株的51.8%和59.1%。 相似文献