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1. Photosynthesis and leaf development of cherry tomato seedlings under different LED-based blue and red photon flux ratios

Creator:
Liu, X. Y., Jiao, X. L., Chang, T. T., Guo, S. R., and Xu, Z. G.
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
chloroplasty, morfologie (biologie), chloroplasts, morphology (biology), leaf density, mesophyll cell, stomata, 2, and 581
Language:
Multiple languages
Description:
We investigated the photosynthesis and leaf development of cherry tomato seedlings grown under five different combinations of red and blue light provided by light-emitting diodes (LEDs). Fresh biomass increased significantly under treatments with blue light percentages of 50, 60, and 75%, with 50% blue-light-grown seedlings accumulating significantly more dry mass. The 25% blue-light-grown seedlings were obviously weaker than those from the other LED treatments. An increase in net photosynthetic rate upon blue light exposure (25-60%) was associated with increases in leaf mass per unit leaf area, leaf area, leaf density, stomatal number, chloroplast and mesophyll cell development, and chlorophyll contents. Our results imply that photosynthesis and leaf development in cherry tomato seedlings are associated with both the proportion and quantity of blue light., X. Y. Liu, X. L. Jiao, T. T. Chang, S. R. Guo, Z. G. Xu., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. Responses of runner bean plants to excess copper as a function of plant growth stages: effects on morphology and structure of primary leaves and their chloroplast ultrastructure

Creator:
Maksymiec, W., Bednara, J., and Baszyński, T.
Format:
print
Type:
model:internalpart and TEXT
Subject:
chlorophyll, CUSO4, digalactosyl diacylglycerol, leaf area, leaf density, monogalactosyl diacylglycerol, Phaseolus coccineus L., senescence, and stroma lamellae
Language:
Multiple languages
Description:
Morphological and ultrastructural changes, the chlorophyll (Chl) content and Chl a fluorescence induction were studied in primary leaves of runner beán plants (Phaseolus coccineus L. cv. Pi?kny Jaš) grown in Knop solution and treated with excess Cu [20 g(CuS04 x 5 H2O) m"^] at difíerent growth stages. The plants were exposed to the metal for 12 d. Cu added to the nutrient solution at the beginning growth stage induced significant leaf area reduction (31 %) as well as increase of Chl accumulation (148 %) and leaf density (122 %). No ultrastructural changes of chloroplasts were seen. Application of Cu at the advanced growth stage caused relatively smáli changes except local disturbances in stroma lamellae and leaf reduction to 70 % of control. Significant disorganization of chloroplast ultrastructure, smáli leaf area reduction (80 %) but specific leaf area increase (163 %) and leaf density decrease (67 %) were seen only in the primary leaves of plants treated with Cu at the finál stage of growth. These changes, similar to senescence response, were accompanied by Fy/Fo ratio decrease to 67 % in comparison with control.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public