HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Carrera, C. Articles by Balzarini, M. Search for Related Content PubMed Articles by Carrera, C. Articles by Balzarini, M. Agricola Articles by Carrera, C. Articles by Balzarini, M. Related Collections Agroclimatology Seed Quality

SEED PHYSIOLOGY, PRODUCTION & TECHNOLOGY

Water Deficit Effect on the Relationship between Temperature during the Seed Fill Period and Soybean Seed Oil and Protein Concentrations

^a INTA Estación Experimental Manfredi. 5988 Manfredi, Córdoba, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas
^b INTA Estación Experimental Manfredi, 5988 Manfredi, Córdoba, Argentina
^c Facultad de Ciencias Agropecuarias. Avda. Valparaíso s/n, Ciudad Universitaria. 5000 Córdoba, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas

^* Corresponding author (carrera.coty{at}gmail.com).

Since most soybean [Glycine max (L.) Merr.] seed is processed into meal and oil, there is a growing concern about environmental effects on soybean seed composition. The aim of this work was to investigate how water deficit affects the well-known relationship of soybean seed oil and protein concentrations with temperature and, alternatively, with solar radiation during seed fill. We analyzed oil and protein data from multienvironment trials in Argentina (latitude 29° to 38° S). Multiple linear regressions were used to test the effect of water deficit on the relationship between oil, protein, and oil + protein and temperature. The functions relating oil and protein concentrations with average daily mean temperature during seed fill (Tm_R5R7) changed with water deficit. When precipitation minus potential evapotranspiration during the reproductive period (pp-PET_R1R7) was lower than 70 mm, oil increased linearly with increasing Tm_R5R7 and with rising water deficit. Meanwhile, protein increased linearly with Tm_R5R7 but decreased linearly with water deficit. Oil + protein concentration held a linear relationship with Tm_R5R7 even under water deficit. Cumulative solar radiation during seed fill predicts seed quality but shows lower significance than Tm_R5R7. This research demonstrates that a water-stress indicator (pp-PET_R1R7) should be considered in rainfed crops because it affects the well-known relationship of soybean seed oil and protein concentrations with temperature.

Abbreviations: PCA, principal component analysis • pp-PET_R5R7, precipitation minus potential evapotranspiration during seed fill • pp-PET_R1R7, precipitation minus potential evapotranspiration during the reproductive period • Sr_R5R7, cumulative solar radiation during seed fill • Tm_R5R7, average daily mean temperature during seed fill • Tmn_R5R7, average daily minimum temperature during seed fill • Tmx_R5R7, average daily maximum temperature during seed fill