Effect of Temperature and Light Intensity Early in Ontogeny on Growth of Pinusresinosa Seedlings

1971 ◽  
Vol 1 (1) ◽  
pp. 57-65 ◽  
Author(s):  
T. T. Kozlowski ◽  
G. A. Borger
Keyword(s):  
Low Temperature ◽  
Light Intensity ◽  
Prolonged Exposure ◽  
Seedling Development ◽  
Effect Of Temperature ◽  
Low Light ◽  
Stage Of Development ◽  
Low Light Intensity ◽  
Early Seedling ◽  
Cotyledon Expansion

Low temperature or low light intensity following germination of Pinusresinosa seeds greatly suppressed subsequent seedling development, with cotyledon expansion inhibited more than root expansion. A strong influence of shoot environment early in ontogeny was demonstrated on initiation of all but a few early-formed primary needle primordia and on expansion of all primary needles, including those formed early. Low temperatures or low light intensities during the cotyledon stage of development prevented initiation of most of the normal complement of primary needles. However, when seedlings were placed in a favorable environment following prolonged exposure to low temperature or low light intensity, primordia of primary needles formed readily and subsequently expanded. Following seed germination, the young seedling is a system of competing carbohydrate sinks. Early development of the seedling is an integrated continuum with the source of growth requirements shifting during ontogeny, from megagametophytes to cotyledons, to primary needles, to secondary needles. The importance of cotyledons and primary needles to early seedling development is emphasized.

The tillering pattern in barley varieties: II. The effect of temperature, light intensity and daylength on the frequency of occurrence of the coleoptile node and second tillers in barley

1969 ◽  
Vol 72 (3) ◽  
pp. 423-435 ◽  
Author(s):  
R. Q. Cannell
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Light Intensity ◽  
Field Experiments ◽  
Tiller Number ◽  
Effect Of Temperature ◽  
Controlled Environment ◽  
Frequency Of Occurrence ◽  
Low Light ◽  
Late Sowing

SUMMARYControlled-environment experiments showed that development of the coleoptile node tiller (T1) was suppressed much more than that of the tiller appearing in the axil of the first true leaf (T2) by high temperature (24/15 °C; 19/10 °C; 10/6 °C), by reduced photoperiod (16 h; 12·5 h) or by low light intensity (1100 ft-c; 1000 ft-c), but minimally in the newest variety, Deba Abed. Unlike previous field experiments, the T1 tiller appeared on more Spratt Archer than Maris Badger plants. Maris Badger plants produced more T1 tillers in a high-low temperature regime (19/10 °C; 10/6 °C) than in continuous low temperature (10/6 °C). In a field experiment T1 tiller number (and yield), but not the number of other major shoots, were severely reduced by late sowing of Spratt Archer, progressively reduced in Maris Badger, but minimally in Deba Abed. This seemed to be associated with higher temperatures at later sowings.

Decreased TK activity alters growth, yield and tolerance to low temperature and low light intensity in transgenic cucumber plants

2014 ◽  
Vol 34 (2) ◽  
pp. 345-354 ◽  
Author(s):  
Huangai Bi ◽  
Xubing Dong ◽  
Guoxiu Wu ◽  
Meiling Wang ◽  
Xizhen Ai
Keyword(s):  
Low Temperature ◽  
Light Intensity ◽  
Growth Yield ◽  
Low Light ◽  
Low Light Intensity

Adaptation of Melampsora medusae to increasing temperature and light intensities on a clone of Populus deltoides

1986 ◽  
Vol 64 (4) ◽  
pp. 834-841 ◽  
Author(s):  
C. S. Prakash ◽  
W. A. Heather
Keyword(s):  
Low Temperature ◽  
Light Intensity ◽  
Populus Deltoides ◽  
High Light Intensity ◽  
Disruptive Selection ◽  
Low Light ◽  
Environmental Selection ◽  
Melampsora Medusae ◽  
Low Light Intensity ◽  
Light Intensities

Race 4A of Melampsora medusae Thum. produces an incompatible reaction on Populus deltoides Marsh. cv. W-79/307 when incubated at high temperature and low light intensity (26 °C and 100 μE∙m−2∙s−1) or low temperature and high light intensity (17 °C and 700 μE∙m−1∙s−1), but a compatible one at low temperature and low light intensity 17 °C and 100 μE∙m−2∙s−1). When in separate studies, a population of this race was sequentially cultured on detached leaves, at increasing temperatures (17, 20, 23, or 26 °C) or light intensities (100, 300, 500, or 700 μE∙m−2∙s−1), isolates that were adpated to each of these regimes were selected. Such isolates, particularly those from low temperature and low light intensity, exhibited some specificity to their "own" environments, although isolates selected at 26 °C and 500 μE∙m−2∙s−1 were most aggressive at all temperatures and light intensity regimes, respectively. Such adaptation appeared to result from pathogen response to host-mediated environmental selection pressure. Isolate, incubating environment, and their interaction were significant contributors to the variation in aggressiveness traits (disease timing and intensity). This rust demonstrates considerable ability to adapt to varying environmental conditions. Thus physical environmental variables may be important selective forces in the regulation of this pathosystem, as spatial and temporal heterogeneity of the environment in nature may result in polymorphism of the pathogen by disruptive selection.

RNA sequencing analysis of low temperature and low light intensity-responsive transcriptomes of zucchini (Cucurbita pepo L.)

2020 ◽  
Vol 265 ◽  
pp. 109263
Author(s):  
Jianting Liu ◽  
Bin Wang ◽  
Yongping Li ◽  
Lifang Huang ◽  
Qianrong Zhang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Light Intensity ◽  
Rna Sequencing ◽  
Cucurbita Pepo ◽  
Sequencing Analysis ◽  
Low Light ◽  
Low Light Intensity

scholarly journals Zinc Seed Priming Improves Spinach Germination at Low Temperature

Agriculture ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 271
Author(s):  
Muhammad Imran ◽  
Asim Mahmood ◽  
Günter Neumann ◽  
Birte Boelt
Keyword(s):  
Low Temperature ◽  
Temperature Stress ◽  
Multispectral Imaging ◽  
Germination Rate ◽  
Cost Effective ◽  
Seed Priming ◽  
Seedling Development ◽  
Low Temperature Stress ◽  
Early Seedling ◽  
Early Seedling Development

Low temperature during germination hinders germination speed and early seedling development. Zn seed priming is a useful and cost-effective tool to improve germination rate and resistance to low temperature stress during germination and early seedling development. Spinach was tested to improve germination and seedling development with Zn seed priming under low temperature stress conditions. Zn priming increased seed Zn concentration up to 48 times. The multispectral imaging technique with VideometerLab was used as a non-destructive method to differentiate unprimed, water- and Zn-primed spinach seeds successfully. Localization of Zn in the seeds was studied using the 1,5-diphenyl thiocarbazone (DTZ) dying technique. Active translocation of primed Zn in the roots of young seedlings was detected with laser confocal microscopy. Zn priming of spinach seeds at 6 mM Zn showed a significant increase in germination rate and total germination under low temperature at 8 °C.

scholarly journals Response of Photosynthesis and Chlorophyll Fluorescence Parameters of Castanopsis kawakamii Seedlings to Forest Gaps

Forests ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 21
Author(s):  
Zhong-sheng He ◽  
Rong Tang ◽  
Meng-jia Li ◽  
Meng-ran Jin ◽  
Cong Xin ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Light Intensity ◽  
Seedling Growth ◽  
Group Treatment ◽  
Control Group ◽  
Low Light ◽  
Chlorophyll Fluorescence Parameters ◽  
Forest Gaps ◽  
Low Light Intensity ◽  
Weak Light

Light is a major environmental factor limiting the growth and survival of plants. The heterogeneity of the light environment after gap formation in forest influences the leaf chlorophyll contents, net photosynthetic rate (Pn), and chlorophyll fluorescence, thus influencing the growth and regeneration of Castanopsis kawakamii seedlings. The aim of this study was to explore the effects of weak light on the photosynthetic physiology of C. kawakamii seedlings in forest gaps and non-gaps. The results showed that (1) the contents of chlorophyll a (Chl-a), chlorophyll b (Chl-b), and total chlorophyll (Chl-T) in forest gaps were lower than in non-gaps. Seedlings tended to increase chlorophyll content to absorb light energy to adapt to low light intensity in non-gap environments. (2) The Pn values of C. kawakamii seedlings in forest gaps were significantly higher than in non-gaps, and forest gaps could improve the seedlings’ photosynthetic capacity. (3) The C. kawakamii seedlings in forest gaps were more sensitive to weak light and control group treatment, especially the tall seedlings, indicating that seedlings require more light to satisfy their growth needs in the winter. The seedlings in non-gaps demonstrated better adaptability to low light intensity. The light intensity was not adequate in weak light conditions and limited seedling growth. We suggest that partial forest selection cutting could improve light intensity in non-gaps, thus promoting seedling growth and regeneration of C. kawakamii more effectively in this forest.

Sign in / Sign up

Export Citation Format

Share Document