摘要
以纽荷尔脐橙为材料,研究叶片黄化和叶脉肿裂过程中的镁和硼元素丰缺变化。试验结果表明,纽荷尔脐橙叶片黄化均伴随叶脉的肿大和爆裂并随叶龄的增长而加重,叶片中镁含量随叶龄增长而显著下降,且其下降与叶片黄化和叶脉肿裂进程同步;但叶片中硼含量随叶龄的增加而上升;黄化和叶脉肿裂的叶片中镁含量0.75～1.16 g/kg,远低于适宜范围(3～5 g/kg),而硼含量为78.4～82.9 mg/kg,处于适宜范围(36～100 mg/kg);叶片镁含量与相对叶绿素含量呈极显著正相关,相关系数R2为0.808;而叶片中硼含量与相对叶绿素含量相关系数R2仅为0.111,无显著相关性。初步结果显示,缺镁是导致纽荷尔脐橙叶片黄化和叶脉肿裂的原因。
Newhall navel orange（Citrus sinensis Osbeck） trees on trifoliate orange（Poncirus trifoliata（L.））rootstocks at Panlong orchard in Ganzhou,Jiangxi province were used to study the relationship between leaf yellowing with vein swelling or cracking（YVSC） and Mg,B element concentrations.Results showed that Mg concentration in leaf decreased gradually as leaves got older,and significant decrease occurred from March to August in 2-year-old leaves on trees with YVSC symptom,and the development of leaf YVSC was concomitant with the decrease in Mg concentration and with the increase in B concentration in leaves.The concentrations in YVSC leaves were 0.75～1.16 g/kg（in deficient range） for Mg and 78.4～82.9 mg/kg（in optimum range） for B,respectively.There was a very significant positive correlation between the contents of leaf relative chlorophyll and leaf Mg and the correlation coefficient was 0.808 whereas the correlation between the contents of relative chlorophyll and B was insignificant since the correlation coefficient was only 0.111.This study showed that Mg deficiency was the reason for leaf YVSC of Newhall naval orange.
出处
《中国南方果树》
北大核心
2010年第4期1-5,共5页
South China Fruits
基金
国家科技支撑项目课题(2007BAD61B03)
公益性行业(农业)科技专项(NYHYZX07-023)
现代柑桔产业技术体系建设专项资金资助
关键词
纽荷尔脐橙
叶片黄化
叶脉肿裂
镁
硼
Navel orange
Leaf yellowing
Vein corkiness
Magnesium
Boron
