Effect of Photoperiod at Different Growth Stages on the Initiation of Spikelet Primordia in Wheat

1984 ◽  
Vol 11 (2) ◽  
pp. 17 ◽  
Author(s):  
MJ Pinthus ◽  
H Nerson
Keyword(s):  
Triticum Aestivum ◽  
Triticum Aestivum L ◽  
Central Portion ◽  
Short Photoperiod ◽  
Growth Stages ◽  
Floral Initiation ◽  
Final Number ◽  
Long Photoperiod ◽  
Different Growth Stages ◽  
Double Ridge

Leaf and spikelet initiation of wheat (Triticum aestivum L.) was studied on plants grown in cabinets under a range of constant photoperiod regimes and on plants transferred, at different growth stages, between these regimes. The existence of genotypically specific limits to the effects of short photoperiods on the delay in floral initiation and on the increase in the number of spikelets was demonstrated. A long photoperiod applied after the onset of apex elongation, but not earlier, induced the differentiation of spikelets in the axils of already existing primordia, which under a short photoperiod would have developed into leaves. The initiation of the terminal spikelet was induced by a long photoperiod applied not later than the double ridge stage. The final number of spikelets had been determined by the time of swelling of the spikelet primordia in the central portion of the spike.

scholarly journals Morpho-physiological responses in wheat (Triticum aestivum L) influenced by normal and water stress conditions

2021 ◽  
Vol 2 (1) ◽  
pp. 1-10
Author(s):  
Piar Ali Shar ◽  
Akhtar Hussain Shar ◽  
Shabana Memon ◽  
Ayaz Ali Soomro ◽  
Saleem Ahmed Naich ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Grain Yield ◽  
Physiological Response ◽  
Physiological Responses ◽  
Triticum Aestivum L ◽  
Growth Stages ◽  
Rabi Season ◽  
Booting Stage ◽  
The World ◽  
Different Growth Stages

Drought is a disaster around the world accumulating salt and ero-sion in lands. Presently, a research was conducted to determine the morpho-physiological response in bread wheat under normal and stress irrigations. This experiment was conducted at the experimental field of Sindh Agriculture University, Tandojam, Hy-derabad, Pakistan, for two consecutive years during the Rabi season of the year 2011-12 and 2012-13. Stress was imposed by withhold-ing irrigations at three different growth stages of the plant, i.e. T1: normal irrigations applied, T2: stress at tillering stage, and T3: stress at the booting stage. The progenies Sarsabz x Khirman and Sarsabz x TD-1 contributed the highest heritability% (81.0% and 85.5%) for osmotic potential (-MPa) at stress at booting stage. For grain yield spike-1(g), the progeny Kiran-95 x Khirman showed maximum her-itability as 84.37 in T3. However, the progeny TD-1 x Imdad proved to be the best combiner progeny indicating highest heritability per-centage (91.0%) among the progenies for grain yield at booting stress.

scholarly journals   Effects of high concentrations of soil arsenic on the growth of winter wheat (Triticum aestivum L) and rape (Brassica napus)

2012 ◽  
Vol 58 (No. 1) ◽  
pp. 22-27 ◽  
Author(s):  
Q. Liu ◽  
C. Zheng ◽  
C.X. Hu ◽  
Q. Tan ◽  
X.C. Sun ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Food Production ◽  
Triticum Aestivum L ◽  
Growth Stages ◽  
Wheat Shoot ◽  
Soil Arsenic ◽  
High Concentrations ◽  
As Stress ◽  
Different Growth Stages

Soil arsenic (As) levels are particularly high in parts of China, where wheat and rape are widely grown. Understanding the effects of As concentration on the growth of these two major crops is of significance for food production and security in China. A pot experiment was carried out to study the uptake of As and phosphorus (P), and the soil As bioavailability at different growth stages of wheat and rape. The results indicated that winter wheat was much more sensitive to As stress than rape. Wheat yields were elevated at low rates of As addition (< 60 mg/kg) but reduced at high rates of As concentrations (80–100 mg/kg); while the growth of rape hadn’t showed significant responses to As addition. Phosphorus concentrations in wheat at jointing and ear sprouting stages increased with increasing soil As concentrations, and these increases were assumed to contribute a lot to enhanced growth of wheat at low As treatments. Arsenic did not significantly affect P concentrations in rape either. The highest As concentrations in wheat shoot and rape leaf were 8.31 and 3.63 mg/kg, respectively. Arsenic concentrations in wheat and rape grains did not exceed the maximum permissible limit for food stuffs of 1.0 mg/kg. When soil As concentration was less than 60 mg/kg, both wheat and rape could grow satisfactorily without adverse effects; when soil As concentration was 80–100 mg/kg, rape was more suitable to be planted than wheat.    

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