The Journal "Agriculture and Forestry"
Časopis "Poljoprivreda i šumarstvo"
- Since 1955 -
Year 2013, Volume 59 Issue 4
| Year : | 2013 |
| Volume : | 59 |
| Issue : | 4 |
| Authors : | Hamid MOHAMMADI, Foad MORADI |
| Title : | EFFECTS OF PLANT GROWTH REGULATORS ON ENDOGENOUS HORMONES IN TWO WHEAT CULTIVARS DIFFERING IN KERNEL SIZE UNDER CONTROL AND WATER STRESS CONDITIONS |
| Abstract : | In arid and semi-arid regions, wheat productivity is limited by terminal water stress during grain-filling. An experiment which repeated twice was conducted to determine of the changes in the levels of endogenous IAA and ABA during grain filling of two wheat cultivars with different kernel size. Treatments were two Iranian wheat cultivars, water stress levels and hormones. Plants were exposed to water stress after anthesis. Benzylaminopurine (BAP) and Abscisic acid (ABA) were applied at two stages either at initial grain-filling starting 2 days post-anthesis or at early grain-filling starting 11 days post-anthesis. Water stress resulted in reduction of grain yield, biological yield, and HI in both cultivars. Water stress caused significant reduction in 1000 grain weight in two cultivars but the rate of drop was lower in high yield cultivar. BAP application after anthesis increased grain weight, although the rate of increase was varied in cultivars. At the initial grain-filling period, exogenous application of ABA increased HI and 1000-grain weight under two conditions. Indole-3-acetic acid (IAA) levels of grains were high at the early stages of grain-filling, whilst ABA level was greater at the linear grain filling stages. Results suggested that differences between cultivars in case of grain yield and its component substantially resulted from variations of hormonal levels (IAA and ABA). Consequently, Increasing of sink strength and HI with hormonal application might be key factors for improving of wheat grain yield. |
| For citation : | Hamid MOHAMMADI, Foad MORADI (2013): EFFECTS OF PLANT GROWTH REGULATORS ON ENDOGENOUS HORMONES IN TWO WHEAT CULTIVARS DIFFERING IN KERNEL SIZE UNDER CONTROL AND WATER STRESS CONDITIONS. Agriculture & Forestry, Vol. 59. Issue 4: 81-94, 2013, Podgorica |
| Keywords : | Indole-3-acetic acid, Ascisic acid, Drought, Wheat, Sink strength, Hormonal application |
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