%0 Journal Article
%T Relaciones h¨ªdricas y temperaturas altas en frijol del tipo ¡°flor de mayo¡±
%A Barrios-G¨®mez
%A Edwin Javier
%A L¨®pez-Casta£¿eda
%A C¨¢ndido
%A Kohashi-Shibata
%A Josu¨¦
%J Agronom¨ªa Costarricense
%D 2011
%I Universidad de Costa Rica
%X 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 (¦×=-0.33 mpa), osmotic (¦Ğ=-1.26 mpa) and turgor (p=0.93 mpa) potentials at mi were higher than at crf (¦×=-0.77, ¦Ğ=-1.36 y p=0.59 mpa) and mrf (¦×=-1.22, ¦Ğ=-1.57 y p=0.35 mpa); mrf with a greater soil water deficit, showed greater reduction in ¦× and ¦Ğ 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¡ãc) was lower than at crf (30.8¡ãc) and mrf (36.6¡ãc); 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 ¦Ğ at mrf. the high ct also had a significant effect in the fabm and 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 (-1oc) increase in ct, respectively.
%K water
%K osmotic and turgor potentials
%K osmotic adjustment
%K heat
%K canopy temperature
%K irrigation
%K rainfed.
%U http://www.scielo.sa.cr/scielo.php?script=sci_abstract&pid=S0377-94242011000100007&lng=en&nrm=iso&tlng=en