The effect of water deficit on leaf stomatal conductance, water relations, chlorophyll fluorescence and growth of rootstock-scion combinations of cacao

被引:2
|
作者
Jaimez, Ramon E. [1 ]
Pena, Geover [2 ]
Barragan, Luigy [3 ]
Chica, Eduardo [4 ]
Arteaga, Francisco [1 ]
Cedeno, George [1 ]
机构
[1] Univ Tecn Manabi, Fac Ingn Agron, Grp Invest Manejo Nutr & Ecofisiol Cult, Manabi, Ecuador
[2] Inst Nacl Invest Agr, Estn Expt Trop Portoviejo, Manabi, Ecuador
[3] Mars La Cola MLCH CL, Cerecita, Guayas, Ecuador
[4] Univ Cuenca, Fac Ciencias Agr, Cuenca, Ecuador
关键词
Cacao physiology; Cacao seedling; Drought tolerance; Selection of genotypes; Leaf water potential; CULTIVARS THEOBROMA-CACAO; DROUGHT; PHOTOSYNTHESIS; RESPONSES; TRAITS; L; STRESS; IMPACT; TREES; DRY;
D O I
10.1016/j.scienta.2023.112335
中图分类号
S6 [园艺];
学科分类号
0902 ;
摘要
Adverse effects caused by drought on cacao seedlings can produce significant yield losses and require a better understanding of plant-tolerance mechanisms in order to overcome them. The selection of drought-tolerant rootstocks is a key strategy to achieve greater resilience in water-limited environments. This study aimed to assess leaf ecophysiological responses and growth of four rootstocks and 24 rookstock-scion combinations to water deficit. Leaf stomatal conductance (gs), leaf water potential ('Pleaf) and relative quantum yield of PSII (& phi;PSII) were measured in irrigated and non-irrigated seedlings. Data were recorded 14 and 20 days after irri-gation was suspended in the non-irrigated seedlings. Biomass of leaf, stem and root as well root volume were determined 24 days after irrigation was withheld. The EET-400 rootstock showed significantly higher values of 'Pleaf at both 14 and 20 days under water deficit. This rootstock and IMC-67 showed the highest gs after 14 days without irrigation The relationship between 'Pleaf and gs showed that the combinations of rootstock EET-400 with scions EET-575, EET-576 and EETP-800 exhibited the highest values of gs and 'Pleaf. The lower root volumes found under the water deficit condition in EET-400 and IMC-67 demonstrate that tolerance to water deficit by cacao rootstocks is not influenced by a greater contact surface of the root with the soil.
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页数:13
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