scholarly journals Effect of ammonium/nitrate ratio on pak choi (Brassica chinensis L.) photosynthetic capacity and biomass accumulation under low light intensity and water deficit

2018 ◽  
Vol 56 (4) ◽  
pp. 1039-1046 ◽  
Author(s):  
H.Q. Shang ◽  
G.M. Shen
Keyword(s):  
Light Intensity ◽  
Ammonium Nitrate ◽  
Water Deficit ◽  
Photosynthetic Capacity ◽  
Biomass Accumulation ◽  
Low Light ◽  
Pak Choi ◽  
Brassica Chinensis ◽  
Low Light Intensity

scholarly journals Exogenously applied 5-aminolevulinic acid mediated physiochemical regulations ameliorate weak light stress in tobacco seedlings

2019 ◽  
Vol 48 (2) ◽  
pp. 353-358
Author(s):  
Najia Li ◽  
Muhammad Shahid ◽  
Xuefeng Zong ◽  
Jun Lv ◽  
Daibin Wang ◽  
...  
Keyword(s):  
Light Intensity ◽  
Aminolevulinic Acid ◽  
Light Stress ◽  
Biomass Accumulation ◽  
Low Light ◽  
Chlorophyll Contents ◽  
Adverse Impacts ◽  
Low Light Intensity ◽  
Tobacco Seedlings ◽  
Weak Light

Experiments were conducted to study the deleterious impacts of low intensity light on physiochemical and agronomic attributes of tobacco, to evaluate varying doses of foliar 5-aminolevulinic acid (5-ALA) for alleviation of adverse impacts of low light intensity and to observe either 5-ALA modulated physiochemical regulations impart stress tolerance at agronomic level. Significant decrease of biomass accumulation, synthesis of osmo-protectants, chlorophyll contents, and chlorophyll fluorescence and increase in malondialdehyde were recorded compared to control. Exogenous application of 5-ALA excellently alleviated adverse impacts of low light intensity stress on agronomic and physiochemical attributes of tobacco seedlings. Conclusively, Light stress had adverse implications on all studied attributes while 5-ALA at 10-20 mg/l had remarkable alleviated deleterious impacts of light stress on plant.

scholarly journals Nitric Oxide Is Involved in the Regulation of the Ascorbate–Glutathione Cycle Induced by the Appropriate Ammonium: Nitrate to Mitigate Low Light Stress in Brassica pekinensis

Plants ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 489 ◽  
Author(s):  
Linli Hu ◽  
Yutong Li ◽  
Yue Wu ◽  
Jian Lv ◽  
Mohammed Mujitaba Dawuda ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Light Intensity ◽  
Ammonium Nitrate ◽  
Chinese Cabbage ◽  
Light Stress ◽  
Ascorbate Oxidase ◽  
Monodehydroascorbate Reductase ◽  
Low Light ◽  
Low Light Intensity ◽  
Low Light Stress

Low light intensity is common in northern China due to fog or haze, and causes stress for crop plants. To solve the problem of low light intensity stress on the growth and development of vegetable crops in China, new cropping strategies must be developed. We previously showed that an appropriate ratio of ammonium and nitrate (NH4+:NO3−) can alleviate the effect of low light stress on plants, although it is not clear what mechanism is involved in this alleviation. We propose the hypothesis that an appropriate ammonium/nitrate ratio (10:90) can induce NO synthesis to regulate the AsA-GSH cycle in mini Chinese cabbage seedlings under low light intensity. To test the hypothesis, we conducted a series of hydroponic experiments. The results indicated that, under low light intensity conditions, appropriate NH4+:NO3− (N, NH4+:NO3− = 10:90) decreased the contents of malondialdehyde (MDA), hydrogen peroxide (H2O2), and superoxide anion (O2−) in leaves compared with nitrate treatment. Exogenous nitric oxide (SNP) had the same effects on MDA, H2O2, and O2−. However, with the addition of a NO scavenger (hemoglobin, Hb) and NO inhibitors (N-nitro-l-arginine methyl ester, L-NAME), NaN3 (NR inhibitor) significantly increased the contents of MDA, H2O2, and O2-. The application of N solution enhanced the AsA-GSH cycle by increasing the activities of ascorbate peroxidase (APX), glutathione reductase (GR), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), and ascorbate oxidase (AAO), compared with control (NH4+:NO3− = 0:100). Meanwhile, exogenous SNP significantly increased the above indicators. All these effects of N on AsA-GSH cycle were inhibited by the addition of Hb, L-NAME and NaN3 in N solution. The results also revealed that the N and SNP treatments upregulated the relative expression level of GR, MDHAR1, APXT, DHAR2, and AAO gene in mini Chinese cabbage leaves under low light stress. These results demonstrated that the appropriate NH4+:NO3− (10:90) induced NO synthesis which regulates the AsA-GSH cycle in mini Chinese cabbage seedlings under low light stress.

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.

Moderate ammonium:nitrate alleviates low light intensity stress in mini Chinese cabbage seedling by regulating root architecture and photosynthesis

2015 ◽  
Vol 186 ◽  
pp. 143-153 ◽  
Author(s):  
Linli Hu ◽  
Jihua Yu ◽  
Weibiao Liao ◽  
Guobin Zhang ◽  
Jianming Xie ◽  
...  
Keyword(s):  
Light Intensity ◽  
Chinese Cabbage ◽  
Root Architecture ◽  
Low Light ◽  
Low Light Intensity ◽  
Intensity Stress

scholarly journals The Effect of Low Light Intensity on the Early Development of Radish Hypocotyl

1983 ◽  
Vol 51 (4) ◽  
pp. 421-426 ◽  
Author(s):  
Yasuyoshi HAYATA ◽  
Yutaka SHINOHARA ◽  
Yoshio SUZUKI
Keyword(s):  
Light Intensity ◽  
Early Development ◽  
Low Light ◽  
Low Light Intensity
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