作者：Martinez-Cuenca, M. R.， Quinones, A.， Forner-Giner, M. A.
作者单位：(Mary-Rus Martínez-Cuenca)Departamento de Citricultura y Producción Vegetal, Instituto Valenciano de Investigaciones Agrarias, Valencia, Spain Email:martinez mru@gva.es
摘要：Iron (Fe) chlorosis is one of the commonest problems in calcareous soils and plant tolerance is deter-
mined mainly by rootstocks. This work evaluates new citrus hybrids’ tolerance to Fe chlorosis compared with the most widely used rootstocks in Spain: Citrus macrophylla (CM, Fe chlorosis-tolerant) and Carrizo citrange (CC, Fe chlorosis-sensitive). Growth parameters, Fe concentration, photosynthetic parameters,ferric chelate reductase (FC-R) activity and proton (H + ) extrusion capacity were assessed in plants irrigated with 20 (control, Ct) or 0 (Fe-deficient, -Fe) ?M FeEDDHA. Some—Fe hybrids presented marked Fe chlorosis symptomatology reflected by the root:shoot ratio and Chl a and b concentrations sharply dropping, and an increase in the Chl a/b ratio. These effects were very strong in the 050119, 050124-B and 050110—Fe species. The net CO 2 assimilation rate significantly lowered in the 05019, 050131, 050125,050112 and 05013—Fe species. The 050120, 050125, 050112 and 050124-B—Fe plants presented lower stomatal conductance than the Ct ones. Conversely, the internal CO 2 concentration (Ci) tended to increase in Fe-deprived plants. Fe-deficiency increased FC-R activity and H + extrusion in some 0501 species. Both responses
were significantly induced in the CM, 050114, 05019, 050131 and 050125—Fe plants. Fe 2+
accumulation in—Fe plants related inversely with FC-R activity. Most—Fe species with the greatest FC-R activity also accumulated the most Fe 3+ ions and, therefore, the Fe pool was much larger in the root apoplast.Collectively, the main trait that determined Fe-chlorosis tolerance among these genotypes was the ability to: (1) boost Fe 3+ reduction in response to Fe-deficiency; (2) acidify root media; (3) benefit the Fe amounts stored in the root apoplast.
关键词：Chlorophyll concentration,Citrus hybrids,Fe 2+ concentration,Ferric-chelate redu
文献注录：Martinez-Cuenca, M. R.， Quinones, A.， Forner-Giner, M. A.. Screening of \'King\' mandarin (Citrus nobilis Lour) x Poncirus trifoliata ((L.) Raf.) hybrids as citrus rootstocks tolerants to iron chlorosis [J]. Scientia Horticulturae. 2016, 198: 61-69.
报/刊名：《Scientia Horticulturae》，发表于2016 / 第 198 期。
文献类型： [J]
页码：第 61-69 页 / 共9 页