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大丽花品种资源的研究 总被引:6,自引:0,他引:6
探讨了大丽花品种花型的演变与进化教唆地我国的大丽花品种资源作了初步调查,对品种分类推进了比较研究,按照花朵特征,花瓣形状变化及花蕊瓣化程度,将大丽花品种分为10个花型,根据调查发现生产存在的问题,并提出具体解决途径。 相似文献
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目的探讨如何提高大丽花的抗病性.方法以大丽花为实验材料,使用水杨酸(SA)叶面喷施处理方式,分析在水杨酸处理其植株叶片后,随时间变化,不同浓度的水杨酸对PPO活性的影响,为研究大丽花的抗病性提供实验依据.结果本品种大丽花的PPO最适pH为5.8;SA对大丽花PPO有一定的影响.用低于0.5mmol/L的SA处理后的大丽花,PPO活性无显著影响;1~2mmol/L的SA对PPO活性起促进作用,并且于24h达到高峰;而3mmol/L的SA对PPO活性起明显的抑制作用.而用以上几组浓度的SA处理大丽花后,PPO活性在48~60h之后逐渐恢复到未处理状态.结论外源SA对大丽花进行处理后对PPO活性在一定时间内有诱导作用. 相似文献
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M.A.U. Mridha F. Jabbar M. K. Bhuiyan M. Rahman F. Akter S. Dewan 《林业研究》2007,18(3):236-240
A survey on the symptom and severity of the leaf spot disease of Pongamia pinnata L. was conducted in the nurseries of the Institute of Forestry and Environmental Sciences, University of Chittagong (IFESCU), Bangladesh Forest Research Institute (BFRI) and Aronnak Nursery in Chittagong. The highest infection percentage and disease index were found in IFESCU nursery, followed by BFRI and the lowest was recorded in Aronnak nursery. The associated organism of leaf spot disease of P. pinnata was isolated from the diseased plant parts and the pathogenicity was established with the isolated fungus. Colletorichum gloeosprioides Penz was proved to be pathogenic. The inhibition of mycelial growth of C. gloeosporioides was observed and identified as suitable fungicides (Bavistin, Cupravite and Dithane M-45) and doses (0.05, 0.10, 0.50, 1.00, 1.50 and 2.00). The lowest and highest mycelial growth were respectively found on Bavistin and on Cupravite at the concentration of 0.05 after 8th day of incubation. It indicates that out of the three tested fungicides, Bavistin showed most effective, followed by Diathane M-45, and Cupravite was ineffective for its very little inhibition on mycelial growth. 相似文献
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A total of 24 candidate plus trees (CPTs) of Pongamia pinnata (L.) Pierre. were selected to elucidate their variation and diversity based on thirteen quantitative traits (4 pod traits,
6 seed traits of parent trees and 3 progeny traits) at Forest Research Centre, Institute of Forest Productivity — Mandar,
Ranchi district during 2005–2007. The results show that, CPT-19 had maximum for seven traits viz, pod length (65.6 mm), 100-pod
weight (542.4 g), seed 2D (two dimension) area (351.2 mm2), seed length (27.9 mm), seed breadth (17.4 mm), 100-seed weight (217.9 g) and plant height (164.3 cm). The traits, 100-pod
weight and 100-seed weight had a high heritability (98.4%, 96.9%) accompanied with high genetic advance (46.0%, 34.9%). There
is a positive significant correlation between 100-pod weight and 100-seed weight traits at both genotypic and phenotypic levels
with plant height, collar diameter and volume index at 30 MAS (months after sowing). Volume index expressed a moderate heritability
(47.4%) accompanied with high genetic advance (48.4%), indicating that the character is governed by additive gene effects.
In divergence study, 24 accessions were grouped into 6 clusters on the basis of non-hierarchical euclidian cluster analysis.
The genotypes in cluster IV (CPT-5, CPT-6, CPT-7, CPT-12, CPT-16, CPT-18, CPT-22) and cluster III (CPT-4, CPT-8, CPT-9, CPT-20,
CPT-21) were most heterogeneous and can be best used within group hybridization. The wide diversity exists between the cluster
V and II, followed by cluster II and I and crosses between CPTs of these clusters may result in substantial segregates. It
is revealed that the existence of substantial variation and diversity can be utilized for genetic resource conservation and
further tree improvement programmers of the species. 相似文献
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淹水胁迫对南五味子和海南红豆幼苗光合特性的影响 总被引:1,自引:0,他引:1
对南五味子和海南红豆的1年生实生苗在不同淹水时间下的叶片的光合特性进行了研究。结果表明:随着淹水时间的持续,南五味子幼苗的净光合速率(Pn)小幅波动后升高,而气孔导度(Gs)、蒸腾速率(Tr)和胞间CO2浓度(Ci)先降后升,至淹水20 d时各指标均高于对照;海南红豆幼苗的Pn、Gs、Ci、Tr先降后升,至淹水20 d没有恢复到对照水平;2种幼苗的气孔限制值(Ls)均为先升高后下降;南五味子和海南红豆都有一定的抗涝性,前者具有更强的耐淹水能力。 相似文献
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三个农林复合树种幼苗对施加磷肥的响应:生长和生节能力(英文) 总被引:1,自引:0,他引:1
Mohammad Belal Uddin Sharif Ahmed Mukul Mohammed Abu Sayed Arfin Khan Mohammed Kamal Hossain 《林业研究》2009,20(1):45-48
对苗床培养的楹树、雨豆树和水黄皮袋装幼苗(6月龄)施以80kg·hm-2的磷酸盐,通过比较不同收获间隔期幼苗生长和生节情况,研究了施加磷肥对三个农林复合树种幼苗生长和生节作用。研究表明,施加磷肥显著促进雨豆树和水黄皮幼苗生长,但并未促进楹树幼苗生长。此外,施加磷肥还会显著增加楹树、雨豆树幼苗生节数和节大小,但对水黄皮幼苗作用较小,而且高收割间隔期会降低水黄皮生节表现。 相似文献
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大丽花名优品种的引种及露地栽培技术研究 总被引:4,自引:1,他引:3
大丽花是世界上品种最多的花卉之一,其品种繁多、花大色艳、群体花期长,并具有药用价值。作者在西安植物园于1996年春开始,从甘肃省临洮县引进大丽花名优品种200余个,经过十多年的栽培和研究,在繁殖方法、栽培技术、田间管理、以及越冬贮藏等方面均取得一定进展,值得推广。 相似文献