The Sensitivity of Grain Sorghum (Sorghum bicolor L.) Developmental Stages to Salinity Stress: An Integrated Approach

Authors
M. Kafi 1
M. H. Shariat Jafari 1
A. Moayedi 2
1 Department of Agronomy, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Islamic Republic of Iran.
2 Khorasan Razavi Agricultural and Natural Resource Research Center, Mashhad, Islamic Republic of Iran.
Abstract
To understand the effects of salinity stress on four different growth stages of sorghum, a greenhouse experiment with 10 treatments, considering all possible combinations of salinity stress and salt- free periods was carried out. The four growth stages for stress application included: emergence until growing point differentiation, growing point differentiation until half bloom, half bloom until soft dough, and soft dough until physiological maturity. Treatments were arranged based on randomized complete block design with 3 replications at the Research Greenhouse of theFerdowsiUniversityofMashhadin 2010-2011. Salinity stress during early growth and panicle differentiation declined the plant height and tiller number. The highest biological yield was obtained from the control treatment, but it was the lowest when plants were salinized throughout the growing season. When plants were stress-free at 2-3 early stages and then subjected to salt stress, reductions in total dry matter were remarkably less than those experienced when salinity was imposed in later growth stages, especially if salinity occurred at a late individual stage. Continuation of salt stress from emergence to both blooming and soft dough stages led to remarkably adverse effects on grain yield. The effect of salinity appears to be most effective on yield components that are growing or developing at the time the salt stress is imposed. The critical period of salinity stress for biological yield was more distinct than that of the grain yield. This indicates that sorghum is not sensitive to salinity at seed setting and seed filling periods.

Keywords

1. Ashraf, M. 2004. Some Important Physiological Selection Criteria for Salt Tolerance in Plants. Flora, 199: 361-376.
2. Casper, B. B., Forseth, I. N. and Walt, D. A. 2006. A Stage Base Study of Drought Response in Cryptantha flava (Boraginacea): Gas Exchange, Water Use Efficiency, and Whole Plant Performance. Am. J. Bot., 93(7): 977- 987.
3. Del Amour, F. M., Martinez, V. and Cerd, A. 2001. Salt Tolerance of Tomato Plants as Affected by Stage of Plant Development. Hort. Sci., 36: 1187- 1193.
4. Desclaux, D., Huynh, T. T. and Roumet, P. 2000. Identification of Sorghum Plant Characteristics that Indicate the Timing of Drought Stress. Crop Sci., 40: 716-722.
5. Francois. L. E., Grieve, C. M., Maas, E. V. and Lesch, S. M. 1994. Time of Salt Stress Affects Growth and Yield Components of Irrigated Wheat. Agron. J., 86: 100-107.
6. Hamzei, J., Mohammady Nasab, A. D., Rahimzade Khoie, F., Javanshir, A. and Moghaddam, M. 2007. Critical Period of Weed Control in Three Winter Oilseed Rape (Brassica napus L.). Turk. J. Agric. Forest., 31: 83-90.
7. Hoagland, D. R. and Arnon, D. I. 1950. The Water Culture Method for Growing Plants without Soil. Calif. Agric. Exp. Sta. Circ., 347: 313-320.
8. Houle, G., Morel, L., Reynolds, C. E. and Siegel, J. 2001. The Effect of Salinity on Different Developmental Stages of an Endemic Annual Plant, Aster laurentianus (Asteracea ). Am. J. Bot., 88(1): 62- 67.
9. Jogeswar, G., Pallela, R., Jakka, N. M., Reddy, P. S., Venkateswara Rao, J., Sreenivasulu, N. and Kavi Kishor, P. B. 2006. Antioxidative Response in Different Sorghum Species under Short-term Salinity Stress. Acta Physiol. Plant., 28(5): 465-475.
10. Kafi, M. 2009. The Effects of Salinity and Light on Photosynthesis, Respiration and Chlorophyll Fluorescence in Salt-tolerant and Salt-sensitive Wheat (Triticum aestivum L.) Cultivars. J. Agric. Sci. Tech., 11: 535-547
11. Karimi, J., Ghorbanli, M., Heidari, H., Khavari Nejad, R. A. and Assareh, M. H. 2005. The Effects of NaCl on Growth, Water Relations, Osmolytes, and Ion Content in Kochia prostrata. Biol. Planta, 49: 301- 304.
12. Khatkar, D., and Kuhad, M. S. 2000. Short-term Salinity Induced Changes in Two Wheat Cultivars at Different Growth Stages. Biol. Planta., 43(4): 629-632.
13. Lutts, S., Kinet, J. M. and Bouharmont, J. 1995. Changes in Plant Responses to NaCl during Development of Rice (Oryza sativa L.) Varieties Differing in Salinity Resistance. J. Exp. Bot., 46(12): 1843- 1852.
14. Maas, E. V., Poss, J. A. and Hoffman, G. J. 1986. Salinity Sensitivity of Sorghum at Three Growth Stages. Irrig. Sci., 7: 1- 11.
15. Mahmood, T., Iqbal,N., Raza, H., Qasim, M. and Yasin Ashraf M. 2010. Growth Modulation and Ion Partitioning in Salt Stressed Sorghum (Sorghum bicolor L.) by Exogenous Supply of Salicylic Acid. Pak. J. Bot., 42(5): 3047-3054.
16. Netonda, G. W., Onyango, J. C. and Beck, E. 2004. Sorghum and Salinity. I. Responses of Growth, Water Relations, and Ion Accumulation to NaCl Salinity. Crop Sci., 44: 797- 805.
17. Sabir, P., Ashraf M. and Akram N. A. 2011. Accession Variation for Salt Tolerance in Proso Millet (Panicum miliaceum L.) Using Leaf Proline Content and Activities of Some Key Antioxidant Enzymes. J. Agron. Crop Sci., 197: 340–347.
18. Shariat Jafari, M. H., Kafi, M. and Astaraie A. 2009. Interactive Effects of NaCl Induced Salinity, Calcium and Potassium on Physiomorphological Traits of Sorghum (Sorghum bicolor L.). Pak. J. Bot., 41(6): 3053- 3063.
19. Vandrelip, R. L. 1993. How a Sorghum Plant Develops. URL: http://www.oznet.ksu.edu/library/crps12/samplers/s3.asp; Retrieved 3 December, 2008.
20. Wilson, C., Lesch, S. M. and Grieve, C. M. 2000. Growth Stage Modulates Salinity Tolerance of New Zealand Spinach (Tetragonia teragonioides Pall.) and Red Orach (Atriplex hortensis L.). Ann. Bot., 85: 501- 509.
21. Yan, K., Chen, P., Shao, H., Zhao, S., Zhang, L., Zhang, L., Xu, G. and Sun, J. 2012: Responses of Photosynthesis and Photosystem II to Higher Temperature and Salt Stress in Sorghum. J. Agron. Crop Sci., 198(3): 218-225.
22. Zeng, L., Shannon, M. and Lesch. S. M. 2001. Timing of Salinity Stress Affects Rice Growth and Yield Components. Agric. Water Manag., 48(3): 191- 206.
Journal of Agricultural Science and Technology
Volume 15, Issue 4
July and August 2013
Pages 723-736