NET PHOTOSYNTHESIS AND EAR GRAIN CONTENT IN THE VARIETIES OF SPRING WHEAT UNDER THE INFLUENCE OF DONOR-ACCEPTOR RELATIONS

2012 ◽  
pp. 66-71
Author(s):  
E.F. Ionov ◽  
◽  
N.E. Ionova ◽  
V.A. Dragavtsev ◽  
◽  
...  
Keyword(s):  
Spring Wheat ◽  
Net Photosynthesis ◽  
Donor Acceptor

Formation of the photosynthetic indicators of spring wheat depending on the variety and pre-sowing treatment

10.12737/1361 ◽  
2013 ◽  
Vol 8 (3) ◽  
pp. 96-100
Author(s):  
Воробьева ◽  
Tatyana Vorobeva ◽  
Шашкаров ◽  
Leonid Shashkarov
Keyword(s):  
Leaf Area ◽  
Spring Wheat ◽  
Photosynthetically Active Radiation ◽  
Seed Treatment ◽  
Net Photosynthesis ◽  
Coefficient Of Performance ◽  
Cropping Pattern ◽  
Efficiency Coefficient ◽  
Active Radiation ◽  
Photosynthetic Productivity

This article describes the formation of leaf area, photosynthetic capacity of crops, the net photosynthetic efficiency, leaves productivity and efficiency, Coefficient of performance (COP) of photosynthetically active radiation (PAR) of spring wheat, using Nano- Gro seed treatment instead of the traditional etching, depending on the varietal characteristics o dark gray forest soils of the Nizhniy Novgorod region. The study was carried out on varieties Margarita, Marusya and Sofia. In connection with this problem, above-mentioned issues are relevant to the present day. Rising the yields of spring wheat to the level of its genetically determined potential is only possible with an increase in photosynthetic productivity of crops, primarily due to the proper selection of varieties for specific soil-climatic zones. Cropping pattern should provide the absorption of at least 2% of PAR. The main absorbing body is a leaf. Therefore the need for a crop with optimum leaf surface area. The study revealed the following, the maximum leaf area of plants of spring wheat is formed in earing seed treatment by Nano-Gro. On average, during the growing season net photosynthesis productivity of Margarita variety was 4.5-5.7 g/m2, Maroussia - 4.6-4.8 g/m2 and Sofia - 3.8-5.2 g/m2. Maximum values of net photosynthetic productivity of crops are characterized by variations in seed treatment by Nano-Gro and Margarita variety. The highest efficiency (2.46, 2.57 and 2.55 kg by 1000 units) was observed on the leaves treated by Nano-Gro and the efficiency of Coefficient of performance (COP) of photosynthetically active radiation (PAR) is 1,54-1,81 %. Margarita and Marussia were characterized by maximum values of productivity of leaf and Coefficient of performance (COP) of photosynthetically active radiation (PAR).

GROWTH RATES, HARVEST INDEX AND MOISTURE USE OF MANITOU SPRING WHEAT AS INFLUENCED BY NITROGEN, TEMPERATURE AND MOISTURE

1984 ◽  
Vol 64 (4) ◽  
pp. 825-839 ◽  
Author(s):  
H. R. DAVIDSON ◽  
C. A. CAMPBELL
Keyword(s):  
Growth Rate ◽  
Spring Wheat ◽  
Growth Rates ◽  
Harvest Index ◽  
Net Photosynthesis ◽  
Moisture Stress ◽  
Growth Stages ◽  
Relative Growth ◽  
Absolute Growth Rate ◽  
Absolute Growth

Manitou spring wheat (Triticum aestivum L.) was grown at combinations of three day/night temperatures (27/12 °C (T27), 22/12 °C (T22) and 17/12 °C (T17)), three levels of fertilizer N (58, 116 and 174 kg/ha), and three moisture stresses (nominally −0.03, −1.5 and −4.0 MPa) applied for four durations (viz., no stress throughout, stress from (i) four-tiller (Tg), (ii) near ligule of last leaf visible (LLV), or (iii) flowering (F1) stages to harvest (Hvst)). Weights of plant parts and photosynthetic area of leaves and stems were measured at eight growth stages. Mean net rate of photosynthesis [Formula: see text] was estimated by dividing plant dry weight by photosynthetic area duration. Temperature was the main factor affecting net photosynthesis and growth. Under optimum moisture and fertility, net photosynthesis was inversely related to temperature being 1.15, 1.19 and 1.29 μg∙cm−2∙day−1 at T27, T22 and T17, respectively. However, absolute growth rates were highest at T22. For example, at low moisture stress and N174, absolute growth rates were 0.69, 0.77 and 0.66 g∙day−1 at T27, T22 and T17, respectively. High moisture stress from Tg to maturity reduced absolute growth rate by about 60%. Low N rates also reduced absolute growth rate. Relative growth rate was constant and highest between emergence and LLV; it then declined rapidly and was negative after soft dough. It was suggested that the absolute growth rates and relative growth rates generated in this study could be adapted for use in simulation modelling exercises. Moisture stress was the most important factor influencing the proportion of the plant’s weight that was harvested in the grain (harvest index). Moisture stress from Tg to harvest resulted in a harvest index of 0.34 ± 0.03; for all other treatments the index was 0.28 ± 0.01. The rate and amount of water used by the plants was greatest at T27 and lowest at T22, consequently water use effeciency was lowest at T27 and highest at T22.Key words: Net photosynthesis, growth kinetics of wheat, leaf area duration

Evidence of a donor-acceptor type transition in CuGaSe2

1980 ◽  
Vol 41 (7) ◽  
pp. 707-712 ◽  
Author(s):  
A. Poure ◽  
G. Aguero ◽  
G. Masse ◽  
J.P. Aicardi
Keyword(s):  
Type Transition ◽  
Donor Acceptor
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