Modification of some growth indices in wheat under water deficit conditions

Subject Areas : Agroecology Journal

Hamid Dehghanzadeh ¹ , manouchehr jam negad ²

1 - faculty member of the islamic azad university, naragh branch, naragh, iran.
2 - faculty member of the islamic azad university, saveh branch, saveh, iran.

Received: 2010-07-06 Accepted : 2011-06-22 Published : 2011-08-23

Keywords: Wheat, leaf area index, deficit irrigation, net assimilation, total dry matter,

Abstract :

The experiment was conducted during 2004-2006 growing seasons at the Agricultural Research Station, Islamic Azad University, Naragh Branch, to evaluate the effects of water deficit on growth indices of three bread wheat (Triticum aestivum L.) cultivars. A split plot experiment based on a randomized complete block design with four replications was used in both years. Irrigation treatments (irrigation after 70 (I1), 90 (I2) and 110 (I3) mm of cumulative evaporation from class A evaporation pan) were considered as the main plot and wheat cultivars (Mahdavy, Sepahan and Roshan-back cross) as subplots. Irrigation after 70 and 90 mm cumulative evaporations did not modify growth indices, significantly. Delay in irrigation from 90 to 110 mm cumulative pan evaporation significantly reduced the growth indices. Pattren of changes in leaf area index (LAI), total dry matter (TDM), net assimilation rate (NAR), and crop growth rate (CGR) were similar in both 70 and 90 mm treatments. At samplings, delay in irrigation from 90 to 110 mm cumulative evaporation lowered the incraese of all growth indices. Pattern of changes in CGR was more similar to LAI but dissimilar to NAR. The results indicated that 22% water could be saved when wheat plants were irrigated after 90 mm of cumulative pan evaporation. However, a decrease of growth indices and grain yield under this water condition was not important.

References:

Ali M, Jensen CR, Mogensen VO, Andersen MN, Henson IE (1999) Root signaling and osmotic adjustment during intermittent soil drying sustain grain yield of field grown wheat. Field Crops Research 62: 35-52.

 Bajii M, Lutts S, Kinet J (2001) Water deficit effect on solute contribution to osmotic adjustment as a function of leaf ageing in three wheat cultivars performing differently in arid conditions. Plant Science 160: 669-681.

Clark JM, Smith TFT, McCaig TN, Green DG (1984) Growth analysis of spring wheat cultivars of varying drought resistance. Crop Science 24: 537-541.

Guttieri MJ, Stark JC, O’Brien K, Souza, E (2001) Relative sensitivity of spring wheat grain yield and quality parameters to moisture deficit. Crop Science 41: 327-335.

Hassanli AM (2000) Different methods of water measurement.Shiraz University Publication. 345 pp.

Hirasawa T, Nakahara M, Isumi T, Iwamoto Y, Ishihara K (1998)  Effect of pre-flowering soil moisture deficits on dry matter production and ecophysiologycal characteristics in soybean plants under well irrigated conditions during grain filling. Plant Production Science 1: 8-17.  

Hosein Poor T, Siadat SA, Mamghani R, Rafiei M (2003) Study some effective morphological and physiological traits on yield and yield components of wheat genotype under deficit irrigation conditions. Iranian Journal of Crop Science 10: 23-36. [In Persian with English Abstract].      

Karimi MM, Siddique KHM (1991) Crop growth and relative growth rate of old and modern wheat cultivars. Australian Journal of Agricultural Research 42: 13-20.

Khajooe Nejad JCH, Kazemi H, Aliari H, Javanshir A, Arvin MCH (2005) Effect of different irrigation levels and plant densities on growth and yield of soybean cultivars. The Scientific Journal of Agriculture 27: 67-88. [In Persian with English Abstract]. 

 Li J, Lee YRG, Assmann SM (1998) Guard cells possess a calcium–dependent protein Kinase that phosphorylates the KAT1 potassium channel. Plant Physiology 116: 785-795.

Mousavi SGH, Mirhadi MJ, Siadat SA, Noor Mohammadi GH, Darvish F (2009) Effect of water stress and nitrogen on yield and water use efficiency of sorghum and millet. Journal of Modern Science of Sustainable Agriculture 15: 101-114. [In Persian with English Abstract].

Moustafa MA, BoersmaLB, Kyonstad WE (1996) Response of four spring wheat cultivars to drought stress. Crop Science 36: 982-986.

 Nakagami  K, Okawa TO, Hirasawa T (2004) Effect of a reduction in soil moisture from one month before flowering through ripening on dry matter production and ecophysiological characteristics of wheat plants. Plant Production Science 7: 143-154.

 Wang CY, Ma Y, Zhou S (1996) Study on effect of soil drought stress on winter wheat senescence. Acta Agricultural University of Henan 30: 309-313.