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

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (10) Citing Articles via Google Scholar Google Scholar Articles by Rodríguez, M. V. Articles by Benech-Arnold, R. L. Search for Related Content PubMed Articles by Rodríguez, M. V. Articles by Benech-Arnold, R. L. Agricola Articles by Rodríguez, M. V. Articles by Benech-Arnold, R. L. Related Collections Other Crop Management Temperature Stress Other Grain Crops Seed Physiology

Predicting Preharvest Sprouting Susceptibility in Barley

A Model Based on Temperature during Grain Filling

IFEVA, Facultad de Agronomía de la Univ. de Buenos Aires, Av. San Martín 4453 (1417) Capital Federal, Argentina

View larger version (19K): [in a new window]   Fig. 1. Evolution of relative grain dry weight on a thermal time scale for Q. Palomar cultivar from different experiments done at the Facultad de Agronomía de la Universidad de Buenos Aires (six in 1995, one in 1996, and four in 1997). Data was fitted to a model with two linear equations (r2 = 0.81, n = 108). Physiological maturity occurred at the interception of both lines, i.e., 440°C-day (SE = 16.2°C-day). Base temperature that maximized r2 was Tb = 5.5°C.

View larger version (23K): [in a new window]   Fig. 2. Germination index for grains harvested before (thermal time scale) and after PM (days after PM scale) for Quilmes Palomar cultivar sown on different dates during 1996, 1997, and 1998. Each value is the average of three subplots. Vertical bars indicate SE.

View larger version (21K): [in a new window]   Fig. 3. Final germination percentage of grains harvested at different times after PM and incubated at 10 and 25°C for Q. Palomar sown on July 1997. Each value is the average of three subplots. Vertical bars indicate SE.

View larger version (24K): [in a new window]   Fig. 4. Dormancy index of grains harvested at different times after PM and incubated at 10 and 25°C for Quilmes Palomar cultivar sown on four different dates during 1997. Each observation is the average of three subplots. Vertical bars indicate SE.

View larger version (14K): [in a new window]   Fig. 5. Linear relationship between GI of grains harvested 12 d after physiological maturity (GI12DAPM) and incubated at 20°C, and mean air temperature occurred between anthesis and PM for Quilmes Palomar cultivar sown on nine dates in 1996, 1997, and 1998. Regression equation: GI12DAPM = 8.7 x TmA-PM - 135.2 (r2 = 0.63, P < 0.05, n = 9). Vertical bars indicate SE.

View larger version (33K): [in a new window]   Fig. 6. Correlation coefficient (r) obtained between GI12DAPM and mean air temperature occurred within 50°C-day intervals at different thermal time (TT) values between anthesis and PM (TT to PM = 440°C-day). Data belong to Q. Palomar cultivar sown on nine dates between 1996 and 1998. Each correlation included nine observations (df = 7). The only significant correlation was that obtained for the 300 to 350°C-day interval (P < 0.0001).

View larger version (18K): [in a new window]   Fig. 7. Linear regression between GI of grains harvested 12 d after PM and incubated at 20°C, and mean air temperature occurred within the 300 to 350°C-day interval after anthesis (Tb = 5.5°C) for Q. Palomar cultivar sown on nine dates between 1996 and 1998. Regression equation: GI12DAPM = 7.14 x Tm300-350 - 98.8 (r2 = 0.95, P < 0.0001, n = 9; SE of estimate: 4.03; regression sum of squares = 2010.5; mean value of independent variable = 19.67). Inset shows association between DI and mean air temperature for the 300 to 350°C-day interval for 1997 experiments (P < 0.05). Vertical bars indicate SE.

View larger version (22K): [in a new window]   Fig. 8. (a) Linear relationship (r2 = 0.77, P < 0.01, n = 20) between mean temperature for the 300 to 350°C-day interval and GI obtained for grains harvested 12 d after PM at validation sites (Cnel. Suárez and Puán, 370 and 450 km away from the FAUBA) and incubated at 20°C. Observations belong to plots of Q. Palomar cultivar sown on different dates or sites during 1998 for each location. The experimental model was developed at the Facultad de Agronomía (Universidad de Buenos Aires) with Q. Palomar sown on nine dates between 1996 and 1998. Slopes of both regression lines did not differ significantly (P > 0.20). (b) Linear relationship between GI of grains harvested 12 d after PM at validation sites and incubated at 6°C, and mean temperature for the 300 to 350°C-day interval (r2 = 0.73, P < 0.05, n = 10). The experimental model predicts GI values for grains incubated at 20°C. Slopes do not differ significantly (P > 0.20). Vertical bars indicate SE.