Barley yield in water-stress conditions.: The influence of precocity,osmotic adjustment and stomatal conductance |
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| Institution: | 1. Servicio de Investigación Agraria, CAM, Apdo. 127, 28800 Alcalá de Henares, Madrid, Spain;2. Centro de Recursos Fitogenéticos, INIA, Apdo. 1045, 28800 Alcalá de Henares, Madrid, Spain;1. Department of Orthopedic Surgery, Korea University College of Medicine, Ansan Hospital, Gyeonggi-do, Republic of Korea;2. Department of Biomedical Engineering, Jungwon University, Chungcheongbuk-do, Republic of Korea;3. Department of Orthopaedic Surgery, Center for Joint Diseases and Rheumatism, Kyung Hee University Hospital at Gangdong, Seoul, Republic of Korea;4. Department of Orthopedic Surgery, Korea University College of Medicine, Guro Hospital, Seoul, Republic of Korea;5. Department of Orthopedic Surgery, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Republic of Korea;6. Department of Orthopedic Surgery, Sungkyunkwan University School of Medicine, Kangbuk Samsung Hospital, Seoul, Republic of Korea;1. Crop Science Department, Faculty of Agriculture, Zagazig University, 44519, Zagazig, Egypt;2. Genetic Resources Department, Desert Research Center, Cairo, 11753, Egypt;3. Genetics Department, Faculty of Agriculture, Zagazig University, 44519, Zagazig, Egypt;4. Department of Geography, Mansoura University, 35516, Mansoura, Egypt;5. Aula Dei Experimental Station, EEAD-CSIC, Avda Montañana, 1005, 50059 Zaragoza, Spain;6. Instituto Pirenaico de Ecologia, CSIC, Avda Montañana, 1005, 50059 Zaragoza, Spain;1. James Hutton Institute, Invergowrie, DD25DA, Scotland, UK;2. Rete Semi Rurali, Italy;3. International Consultant, Italy;4. Agrotecnio Center, Universitat de Lleida, Spain;5. INRAA, Algeria;6. Akdeniz University Faculty of Agriculture, Dept. of Agronomy, Antalya, Turkey;7. Consultant and barley breeder, National Agricultural Research Center, Amman, Jordan;8. Council for Agricultural Research and Economics (CREA) Research Centre for Cereal and Industrial Crops (CREA-CI), S.S. 673 km 25,200, 71122 Foggia, Italy;9. University of Modena and Reggio Emilia, Department of Life Sciences, Via G. Amendola 2, 42122 Reggio Emilia, Italy;10. Council for Agricultural Research and Economics – Research Center for Animal Production and Aquaculture (CREA-ZA), Viale Piacenza, 29, 26900, Lodi, Italy |
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| Abstract: | The behavior of eight cultivated barley (Hordeum vulgare L.) genotypes consisting of three breeding lines and five cultivars varieties was studied in a rain shelter to determine the influence of osmotic adjustment and stomatal conductance on drought tolerance and yield under terminal water stress. When the crop reached the flag leaf stage, half of the experimental plots were submitted to a water-stress treatment and the remainder maintained in optimal water conditions. Variation was observed in osmotic adjustment (OA) and stomatal conductance among the genotypes under stress. Two of the breeding lines exhibited the highest OA capacity. These lines also showed the least differences in stomatal conductance and maintained the highest stomatal conductance as water stress increased. Correlations between yield and OA and conductance in the water-stress treatment were positive and significant. In the irrigated control the correlation coefficients were smaller. Osmotic adjustment and stomatal conductance were linearly related, indicating that OA favors higher conductance when there is water stress. Under conditions of terminal drought yield was negatively correlated with time to ear emergence and maturity. Earliness to flower and OA contributed to greater yields under terminal water stress. |
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