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Paper Information

Journal:   JOURNAL OF AGRICULTURAL SCIENCE (UNIVERSITY OF TABRIZ)   2007 , Volume 17 , Number 2; Page(s) 65 To 81.
 
Paper: 

EFFECT OF NITROGEN AND DROUGHT STRESS ON REMOBILIZATION OF ASSIMILATES FROM VEGETATIVE PARTS AND THEIR CONTRIBUTION TO GRAIN FILLING OF BARLEY

 
 
Author(s):  BARADARAN FIROUZ ABADI M.*, SHAKIBA MOHAMMAD REZA, RAHIMZADEH KHOUEI F., TOURCHI MAHMOUD, TABATABAEI S.J.
 
* DEPARTMENT OF AGRONOMY AND PLANT BREEDING, FACULTY OF AGRICULTURE, UNIVERSITY OF TABRIZ, TABRIZ, IRAN
 
Abstract: 

Pre-anthesis stored dry matter in vegetative tissues of barley (Hordeum vulgare L.) are important, because grain filling and yield frequently depend on the remobilization of pre-anthesis assimilates. In this work that was conducted in the University of Tabriz in 2004 and 2005 (pot and field experiments, respectively), the contribution of leaf, stem and sheath in grain filling were determined in two cultivars of barley, Walfajr and Reihan. Influence of three levels of nitrogen (60, 120 and 180 Kgha-1) and drought stress (>80, 55-65 and 35-45 percentage of field capacity) on accumulation and remobilization of assimilates and their contribution in grain filling were investigated. Maximum pre-anthesis stored dry matter (including non structural carbohydrates and nitrogen) increased in high N treatment. Nitrogen and non structural carbohydrates had the highest values in leaf and sheath, respectively. A significant enhancement of remobilization was observed under drought stress particularly in high N.treatment. Under severe drought stress, harvest index was increased 10% in both pot and field experiments. Remobilization efficiency was higher in flag leaf, peduncle, internode 1 and sheath 4. Prean thesis application of high and normal nitrogen in pot and field experiments, respectively, increased contribution of stem internodes and sheath reserves to grain filling especially, when plants were confronted with drought stress. Peduncle with 3.9% and internode beneath peduncle with 6% and their respective sheaths had the highest contribution to grain filling in pot and field experiments respectively, which was related to the length of these parts. Generally, application of controlled water stress during grain filling period causes a higher remobilization from vegetative tissues before onset of water stress at the end of growing season.

 
Keyword(s): BARLEY, DROUGHT STRESS, DRY MATTER, NITROGEN, NON-STRUCTURAL CARBOHYDRATE, REMOBILIZATION
 
References: 
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