Water relationships and high temperatures in “Flor de Mayo” type beans
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| Autoři: | , , |
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| Médium: | artículo original |
| Stav: | Versión publicada |
| Datum vydání: | 2010 |
| Popis: | Soil water deficit and high air temperature effects on plant water relations and canopy temperature (CT), and seed yield (SY) and its components in 8 “Flor de mayo” (FM) bean varieties and a landrace were studied. Three experiments were carried on under field conditions; montecillo irrigation (MI) with watering from sowing to maturity, montecillo rain-fed (MRF) with rainfall as the only source of water and Celaya rain-fed (CRF) with rainfall + 2 supplementary waterings at flowering. Rates of 80 kg.ha-1 Nitrogen and 40 kg.ha-1 Phosphorous were used. Leaf water (Ψ=-0.33 Mpa), osmotic (π=-1.26 mpa) and turgor (P=0.93 Mpa) potentials at mI were higher than at CRF (Ψ= - 0.77, π=-1.36 y P=0.59 Mpa) and MRF (Ψ=-1.22, π=-1.57 y P=0.35 Mpa); MRF with a greater soil water deficit, showed greater reduction in Ψ and π and higher capacity for osmotic adjustment (OA). OA was positive and significantly related to seed yield (SY) and final aerial biomass (FABM) in the 2 rain-fed environments. Canopy temperature (CT) at MI (26.7°C) was lower than at CRF (30.8°C) and MRF (36.6°C); the heat stress effect increased with the drop in plant water content in the driest environment (MRF); CT was negative and significantly associated with and at MRF. The high CT also had a significant effect in the FABMand SY, and its components; high CT reduced SY, FABM, number of normal pods.m-2 (NP. m-2) and weight of 100 seeds (W100S) by 12.5, 10.7, 10.2 y 3.4% for each ºC (-1 ºC) increase in CT, respectively. |
| Země: | Portal de Revistas UCR |
| Instituce: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| Jazyk: | Español |
| OAI Identifier: | oai:portal.ucr.ac.cr:article/6690 |
| On-line přístup: | https://revistas.ucr.ac.cr/index.php/agrocost/article/view/6690 |
| Klíčové slovo: | Phaseolus vulgaris L potencial hídrico osmótico y de turgencia ajuste osmótico calor temperatura del frijol Flor de mayo riego secano Phaseolus vulgaris L. water osmotic and turgor potentials osmotic adjustment heat canopy temperature irrigation rainfed |