毛叶枣不同种源砧木的抗旱性评价

利用盆栽方法对毛叶枣的4个不同种源的砧木进行了抗水分胁迫试验研究。正常供水条件下几种供试材料的蒸腾作用日变化均表现出“单峰型”的变化趋势。不同种源的毛叶枣砧木苗净光合速率都随土壤含水量的下降而下降,其变化趋势可以由指数方程(y=aebx)拟合,从干旱胁迫开始到中度水分胁迫时(土壤含水量6%),净光合速率的下降幅度由大到小排列次序为:元江毛叶枣>元谋毛叶枣>广州毛叶枣>滇刺枣。当土壤含水量降低到相同水平的6%时,广州毛叶枣的净光合速率比滇刺枣、元江、元谋毛叶枣的净光合速率高,说明在干旱条件下广州毛叶枣具有较高的干物质生产能力。4种毛叶枣砧木在干旱胁迫过程中的水分利用效率与土壤含水量的关系可以用二次回归方程拟合,苗木受到干旱胁迫的初期,水分利用效率随土壤含水量的下降而下降。随着干旱胁迫程度的逐渐加强,当土壤含水量小于8%～10%时,水分利用效率随着土壤含水量的下降而有所提高,体现了供试材料避旱的机制。     

Reciprocal Crosses in Almond

Reciprocal differences were determined in 18 inter-varietal crosses of almond (9 direct and its 9 reciprocals) obtained from 6 varieties by means of hand pollination. Five traits were analyzed over three years (1989—1991) and seven traits over one year (1989). No reciprocal differences were detected for blossom density, percentage of double kernels and kernel smoothness. For flowering times (start, full and end) the differences were nearly inexistent. They were of varying importance for production density, time of ripening, kernel/in-shell ratio and integument colour intensity in some crosses. In these cases, the direction of the cross must be kept in mind in order to improve the efficacy of future breeding programmes.     

蕃拉芦荟水溶性多糖的分离与鉴定

以蕃拉芦荟（ Aloe barbadensis Miller)为材料,从中分离出3种多糖PAB1、PAB2和PAB3。PAB1的总糖含量和糖醛酸含量分别为78.57%和14.59%;PAB2的分别为88.72%和6.90%;PAB3的分别为50.23%和10.9%,蛋白质含量为28.81%。红外光谱、气相色谱、酶水解等测定结果表明,PAB1为葡萄聚糖,PAB2为葡萄甘露聚糖,PAB3是一种含有甘露糖的糖蛋白。     

Decreased nitrogen rates and irrigation effect on celery yield and internal quality

The effect of decreased nitrogen rates (90, 60 and 30 kg N/ha) with and without irrigation on celery yield quantity and internal quality were studied in field experiments in 1993 and 1994. The decreased nitrogen rates reduced yields in both years. In the dry and warm conditions of 1994 nitrogen × irrigation interaction was clearly observed; irrigation increased yield more at higher nitrogen rates than at lower nitrogen rates. In the rainy conditions of 1993 irrigation did not effect the yield level.On the other hand, in both years, decreased nitrogen rates increased dry matter, vitamin C and dietary fiber contents, and nitrogen had a minor effect on total sugar content. In 1994 alpha- and beta carotene and thiamin were also analyzed but nitrogen had no effect on them. Irrigation increased dry matter and total sugar contents at the two lowest nitrogen rates in 1994, but decreased vitamin C contents in both years. There was also slight evidence that irrigation might decrease alpha- and beta-carotene and thiamin contents.     

云南省毛叶枣病害的初步记述

 记述了云南省毛叶枣上的炭疽病、白粉病、树干干腐病、灰霉病、僵果病、煤烟病、黑斑病、疫病和根朽病等9种真菌性病害和缺镁、缺硼、缺铁等3种缺素症。     

粤引大脆蜜青枣品种比较与区域试种试验

粤引大脆蜜青枣品种比较与区域试种试验结果表明:粤引大脆蜜青枣具有叶大、果大、脆甜的特点,性状稳定,适应性强,其果实品质、抗逆性均优于当前主栽品种蜜丝和五千.该品种于2008年5月通过了广东省农作物品种登记.     

粤引大脆蜜青枣引种试验

介绍了粤引大脆蜜青枣的选育和引种过程、生物学特性、主要经济性状和栽培技术要点,为该品种的推广应用提供参考.该品种于2008年5月通过了广东省农作物品种登记.     

药用植物茴香的细胞学研究

采用压片法,对生长在武汉地区的药用植物茴香(Foeniculum vulgareMiller)进行细胞学研究。结果表明:茴香的绝大多数花粉母细胞减数分裂过程中染色体的行为正常,终变期形成11个二价体,为染色体计数的最佳时期;茴香的染色体数目为2n=2x=22,核型公式为K(2n)=22=20m 2sm,其染色体相对长度组成为2n=2s 8M1 10M2 2L,属于“1A”对称型核型。     

毛叶枣的矿质营养特性

以2～3年龄毛叶枣(ZizyphusmauritianaLam.)品种高朗一号为试材,采用大田调查分析和数理统计方法,研究毛叶枣矿质营养特性,结果表明,3年龄毛叶枣在整个生长季节每株树需要纯N156.6g,P14.3g,K194.5g,Ca102.1g,Mg29.0g,B0.25g;不同物候期毛叶枣叶片养分含量存在着差异,N、P以营养缓慢生长期、硬核期含量较高,K含量一直在下降,Ca以采果前后期较高,Mg变化不大;毛叶枣果实养分积累为双S型;高产区叶片N、P含量在营养生长旺盛期、花芽分化初期显著高于低产区。     

NaHSO3对枇杷和毛叶枣叶片光合速率的促进作用

研究了不同浓度的NaHSO3及其与KCl和6—BA配合施用后对田间枇杷和毛叶枣离体叶片光合作用的影响。结果表明：低浓度(2～8mmol/L)的NaHSO3对光合速率有促进作用，作用效果长达6d；高浓度(16mmol／L)的NdKS03对光合速率促进作用不明显。NaHSO3配合1mmol/L KCl和5mmol/L 6—BA施用，对光合速率的促进效果更明显。