不同施硼方式对枳橙砧木生理生化特性的影响

以枳橙砧木为试验材料,设置根施与叶施2种施硼方式,研究不同施硼方式对枳橙砧木的农艺性状、干物质积累量、不同器官各元素(B、K、Ca、Mg)含量以及叶片中糖类、丙二醛(MDA)、脯氨酸(Pro)和叶片伤害率的影响。结果表明:叶施硼显著增加枳橙幼苗茎和叶的干物质质量、总干物质质量和株高,并促进根系的生长;叶片中的B含量提高126.5%,1.3%的B在茎中转移积累,但叶施硼使枳橙根部B含量降低11.1%;叶片中K、Ca、Mg含量均显著高于对照。根施硼各元素(B、K、Ca、Mg)含量均显著高于叶施硼处理(除叶片外);叶片中糖类、MDA、Pro含量和叶片伤害率在施硼后均下降。因此,叶施硼在维持叶片各元素平衡、糖类物质合成和提高叶片抗逆性方面有较好的效果,但叶施硼会降低根系硼含量、加重根系缺硼。

Effects of different ways of boron application on the physiologies and biochemistries of Navel orange root stock

Trifoliate orange was used to set the foliar application and root application with H 3 BO 3 . The effects of different ways of applying boron on agronomic traits of trifoliate orange,dry matter accu-mulation,the contents of boron (B),potassium (K),calcium (Ca),magnesium (Mg)in different parts, and contents of the sugar,malondialdehyde (MDA),proline (Pro)and the injured rate in the leaves were studied.The results showed that different fertilization methods led to quite different results.Foliar boron significantly increased dry weight of stem and leaf of trifoliate orange seedling,total dry weight and height,and promoted the growth of root.Concentration of boron in leaves increased by 126.5%.There was 1.3% boron in stems metastasis and accumulation.Foliar applied boron made boron content decrease by 1 1.1% in trifoliate orange roots.Contents of K,Ca and Mg in leaves under foliar boron were signifi-cantly higher than that of CK.Contents of elements were significantly higher by root giving boron than that by foliar boron (except leaf).Contents of sugar,MDA,Pro and injury rates in leaves decreased after applying boron.Foliar boron had a good effect in maintaining the balance of the elements in leaves,carbo-hydrate synthesis and improving the stress resistance of leaves.It can reduce the content of boron in root and aggravate boron deficiency.