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Start Over Coverage 465-467

4. Temperature-dependent decay-associated fluorescence spectra in phycobilisome-thylakoid membrane complexes from Spirulina platensis

Creator:
Li, Y., Sun, Z.-Y., Ai, X.-C., Zhao, J.-Q., and Zhang, X.-K.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
cyanobacterium and photosystems 1 and 2
Language:
Multiple languages
Description:
The kinetic component (39 ps) for the energy transfer from a phycobilisome (PBS) to the photosystems was temperature-dependent while the components related to the kinetic processes within PBS, photosystem 2 (PS2) or PS1 were temperature-independent. The 39 ps component possessed the amplitude maximum at 647 nm but the minimum at 715 nm (room temperature) or 685 nm (0 °C), suggesting a direct energy transfer from C-phycocyanin to PS1 at room temperature but to PS2 at 0 °C. The temperature-induced kinetic change originated from a position shift of PBS along the thylakoid membrane. and Y. Li ... [et al.].
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

5. Tolerance to water stress in tomato cultivars

Creator:
Srinivasa Rao, N. K. , Bhatt, R. M., and Sadashiva, A. T.
Format:
bez média and svazek
Type:
model:article and TEXT
Language:
Multiple languages
Description:
The effects of plant water stress imposed at vegetative, flowering, and fruiting stages of four cultivars of tomato (Lycopersicon esculentum Mill.) on net photosynthetic rate (PN), stomatal conductance (gs), transpiration rate (E), osmotic adjustment, and crop water stress index (CWSI) were investigated. Osmotic adjustment was the highest in cv. Arka Meghali, followed by cv. RFS-1. CWSI was lowest in cv. Arka Meghali and highest in cv. Pusa Ruby. Significant reduction in gs, E, and PN was observed in all the cultivars. The maximum reduction in E was observed in cv. Arka Saurabh during the fruiting stage (62.4 %) and maximum reduction in PN at the flowering stage in Pusa Ruby (53.1 %). Maximum PN was observed in Arka Meghali under water stress. The values of internal CO2 concentration (Ci) did not follow the decrease in gs which might be taken as an indication of mesophyll (non-stomatal) limitation to PN. Magnitude of PN decrease accompanying gs reductions varied in the four cultivars. Arka Meghali which had highest rate of gas exchange efficiency (PN/gs) under water deficits can be recommended for rainfed cultivation. and N. K. Srinivasa Rao, R. M. Bhatt, A. T. Sadashiva.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public