RECIPROCAL CROSSES ANALYSIS OF THREE PHYSIOLOGICAL CHARACTERS IN TOMATOES UNDER TWO TEMPERATURE REGIMES

1980 ◽  
Vol 60 (4) ◽  
pp. 1289-1293
Author(s):  
THOMAS SHIN-CHAI LI ◽  
C. A. HORNBY
Keyword(s):  
Net Photosynthesis ◽  
Reciprocal Hybrids ◽  
Cytoplasmic Effects ◽  
Net Photosynthesis Rate ◽  
Temperature Regimes ◽  
Nuclear Composition ◽  
Cross Experiment ◽  
Net Assimilation ◽  
Two Temperature ◽  
Physiological Characters

The nuclear and cytoplasmic effects in the net photosynthesis rate, leaf area and net assimilation rate in tomatos were studied in a reciprocal cross experiment involving two parental cultivars, Bonny Best and Immur Prior Beta, and their reciprocal hybrids. Plants were grown under two temperature regimes in growth chambers, 23 ± 1 °C and 12 ± 1 °C, respectively. It was concluded that nuclear composition affected all three characters. Although the cytoplasmic effect sometimes revealed its influence, it was not large enough to warrent consideration in breeding studies.

RECIPROCAL CROSS ANALYSIS OF GROWTH COMPONENT STAGES IN TOMATOES UNDER TWO TEMPERATURE REGIMES

1980 ◽  
Vol 60 (1) ◽  
pp. 163-166
Author(s):  
THOMAS SHIN-CHAI LI ◽  
C. A. HORNBY
Keyword(s):  
Reciprocal Cross ◽  
Reciprocal Hybrids ◽  
Temperature Conditions ◽  
Cytoplasmic Effects ◽  
Temperature Regimes ◽  
Cross Experiment ◽  
Selection For ◽  
Two Temperature

The nuclear and cytoplasmic effects on seven growth component stages in tomatoes were studied in a reciprocal cross experiment involving two parental cultivars, Bonny Best and Immur Prior Beta, and their reciprocal hybrids. These were grown under the two temperature regimes in greenhouses, 17 °C–21 °C and 10 °C–13 °C respectively. There was evidence that cytoplasmic effects were relatively important for some of the characteristics under stress temperature condition. It is suggested that the cytoplasmic effects and genic-cytoplasm interactions should be considered during selection for tomatoes under subnormal temperature conditions.

Two physiological races of Tsuga canadensis in Wisconsin

1975 ◽  
Vol 53 (9) ◽  
pp. 940-951 ◽  
Author(s):  
William Eickmeier ◽  
Michael Adams ◽  
Donald Lester
Keyword(s):  
Dark Respiration ◽  
Net Photosynthesis ◽  
Tsuga Canadensis ◽  
Seedling Morphology ◽  
Seed Sources ◽  
Temperature Regimes ◽  
Disjunct Populations ◽  
Use Efficiency ◽  
Osmotic Potentials ◽  
Carbon Dioxide Balance

Population differentiation in Tsuga canadensis (L.) Carr. from Wisconsin was tested by comparing seedlings grown from seed collected within the present range in the northeast and from seed collected in disjunct populations southwest of the present range. The seedlings, established in hydroponic culture, were subjected to two preconditioning temperature regimes and two water stress simulations. Net photosynthesis, dark respiration, and transpiration capacities were measured and internal leaf resistances were calculated.The southwestern Wisconsin population had a more favorable carbon dioxide balance at warmer tissue temperatures, particularly at low irradiance levels, and at higher osmotic potentials, than did the northeastern population, which was better adapted to lower tissue temperatures and lower osmotic potentials. Additional differences between seed sources in seedling morphology, transpiration rate, and water-use efficiency were found. These differences in morphology and physiological responses corresponded to the macroclimates in which these populations were found, southwestern Wisconsin being warmer and drier than the northeastern part of the state.

Inter- and intra-varietal variation in aerobic methane emissions from environmentally stressed pea plants

Botany ◽  
2018 ◽  
Vol 96 (12) ◽  
pp. 837-850 ◽  
Author(s):  
Awatif M. Abdulmajeed ◽  
Mohammad I. Abo Gamar ◽  
Mirwais M. Qaderi
Keyword(s):  
Stress Factors ◽  
Interactive Effects ◽  
Controlled Environment ◽  
Uvb Radiation ◽  
Pisum Sativum L ◽  
Temperature Regimes ◽  
Varietal Variation ◽  
Growth Chambers ◽  
Effects Of Temperature ◽  
Two Temperature

Environmental stress factors can influence methane (CH4) emissions from plants. There are a few studies on the interactive effects of stress factors on plant aerobic CH4, but none on the comparative evaluation of CH4 emissions between and among plant varieties. We examined the effects of temperature, UVB radiation, and watering regime on CH4 emissions from 10 pea (Pisum sativum L.) varieties first and then selected two varieties with the highest (237J Sundance; var. 1) and lowest (422 Ho Lan Dow; var. 2) emissions for further studies. Plants were grown in controlled-environment growth chambers under two temperature regimes (22 °C / 18 °C and 28 °C / 24 °C, 16 h light / 8 h dark), two UVB levels (0 and 5 kJ·m−2·d−1), and two watering regimes (well-watered and water-stressed) for 14 days, after one week of growth under 22 °C / 18 °C. Higher temperatures and water stress increased CH4 emissions, and increased emission was associated with stress. Pea varieties varied in growth and CH4 emissions; var. 1 was more stressed and had higher emission than var. 2. In the stressed variety, the water-stressed plants grown under higher temperatures at UVB5 had the highest CH4 emission, whereas the well-watered plants grown under lower temperatures at UVB5 had the lowest emission. We conclude that climatic stress conditions increase CH4 emissions, which vary with plant varieties.

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