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Screening of ‘King’ mandarin (Citrus nobilis Lour) × Poncirus trifoliata ((L.) Raf.) hybrids as salt stress-tolerant citrus rootstocks
Horticulture, Environment, and Biotechnology ( IF 2.4 ) Pub Date : 2021-01-05 , DOI: 10.1007/s13580-020-00291-1
Mary-Rus Martínez-Cuenca , Amparo Primo-Capella , Maria Angeles Forner-Giner

This work evaluates new citrus hybrid tolerance to salt stress compared to Carrizo citrange. Growth parameters, ion concentration, photosynthetic parameters, leaf water relation, plant damage and proline concentration were assessed in plants irrigated with 0 (control) or 60 mM of NaCl for 60 days. Some hybrids presented marked salt-stress symptomatology like sharp decreases in plant biomass and RGR parameter, and high leaf burn and abscission percentages. While Cl − accumulation in most salinised genotypes was recorded in all the plant fractions, accumulation occurred in some hybrids only in their aerial organs. Stomatal conductance also lowered under salt conditions in all the hybrids, whereas the internal CO 2 concentration (Ci) tended to increase. Salt stress lowered the leaf water potentials in all the 0501 hybrids. As a response, the salinised plants induced proline accumulation. The main trait that improved salt tolerance in some genotypes is apparently linked with the imbalance among Cl − , Na + and K + ions, especially enhanced K + uptake and transport rates which delay plant damage.

中文翻译:

筛选“王”柑橘 (Citrus nobilis Lour) × Poncirus trifoliata ((L.) Raf.) 杂种作为耐盐柑橘砧木

与 Carrizo citrange 相比,这项工作评估了新的柑橘杂种对盐胁迫的耐受性。在用 0(对照)或 60 mM NaCl 灌溉 60 天的植物中评估生长参数、离子浓度、光合参数、叶水关系、植物损伤和脯氨酸浓度。一些杂种表现出明显的盐胁迫症状,如植物生物量和 RGR 参数急剧下降,以及高叶片燃烧和脱落百分比。虽然在大多数盐渍化基因型中的所有植物部分都记录了 Cl - 积累,但在一些杂种中仅在其气生器官中发生了积累。在盐条件下,所有杂种的气孔导度也降低,而内部 CO 2 浓度 (Ci) 趋于增加。盐胁迫降低了所有 0501 杂种的叶水势。作为回应,盐渍化植物诱导脯氨酸积累。某些基因型提高耐盐性的主要性状显然与Cl - 、Na + 和K + 离子之间的不平衡有关,尤其是K + 吸收和运输速率的提高,从而延迟了植物损伤。
更新日期:2021-01-05
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