Plasticity of the Root System Architecture and Leaf Gas Exchange Parameters Are Important for Maintaining Bottle Gourd Responses under Water Deficit

被引:6
|
作者
Zacarias Rafael, Dinoclaudio [1 ]
Arriagada, Osvin [2 ]
Toro, Guillermo [3 ]
Mashilo, Jacob [4 ]
Mora-Poblete, Freddy [1 ]
Contreras-Soto, Rodrigo Ivan [5 ]
机构
[1] Univ Talca, Inst Biol Sci, Talca 3460000, Chile
[2] Pontificia Univ Catolica Chile, Fac Agron & Ingn Forestal, Dept Ciencias Veget, Santiago 30622, Chile
[3] Ctr Estudios Avanzados Fruticultura CEAF, Plant Stress Physiol Lab, Rengo 2940000, Chile
[4] Limpopo Dept Agr & Rural, ZA-0480 Bela Bela, South Africa
[5] Univ OHiggins, Inst Ciencias Agroalimentarias Anim & Ambientales, San Fernando 3070000, Chile
来源
PLANTS-BASEL | 2020年 / 9卷 / 12期
关键词
rhizoboxes; gaseous exchange; sub-Saharan Africa; root length density; DROUGHT STRESS; USE EFFICIENCY; PHOTOSYNTHESIS; SEEDLINGS; TOLERANCE; REGIMES; TRAITS; TRANSPIRATION; LIMITATIONS; GROWTH;
D O I
10.3390/plants9121697
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The evaluation of root system architecture (RSA) development and the physiological responses of crop plants grown under water-limited conditions are of great importance. The purpose of this study was to examine the short-term variation of the morphological and physiological plasticity of Lagenaria siceraria genotypes under water deficit, evaluating the changes in the relationship between the root system architecture and leaf physiological responses. Bottle gourd genotypes were grown in rhizoboxes under well-watered and water deficit conditions. Significant genotype-water regime interactions were observed for several RSA traits and physiological parameters. Biplot analyses confirmed that the drought-tolerant genotypes (BG-48 and GC) showed a high net CO2 assimilation rate, stomatal conductance, transpiration rates with a smaller length, and a reduced root length density of second-order lateral roots, whereas the genotypes BG-67 and Osorno were identified as drought-sensitive and showed greater values for average root length and the density of second-order lateral roots. Consequently, a reduced length and density of lateral roots in bottle gourd should constitute a response to water deficit. The root traits studied here can be used to evaluate bottle gourd performance under novel water management strategies and as criteria for breeding selection.
引用
收藏
页码:1 / 18
页数:18
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