Stay green is the plant’s ability to sustain photosynthetically functional leaf area for longer periods, even with excessive water stress. This study was done understand gene action that controlled inheritance of stay trait general objective contributing breeding more drought tolerant maize varieties. 10 F1 hybrids from crosses between highly performing and least inbred lines as regards s...

To reveal and quantify the interactive effects of drought stresses and elevated CO2 concentration [CO2] on photochemistry efficiency of cucumber seedlings, the portable chlorophyll meter was used to measure the chlorophyll content, and the Imaging-PAM was used to image the chlorophyll fluorescence parameters and rapid light response curves (RLC) of leaves in two adjacent greenhouses. The result...

Daily variations in photoprotective mechanisms were studied in sun and shade leaves of 40-year-old cork oak (Quercus suber L.) trees during early summer in Portugal. Although trees were not severely water stressed because predawn leaf water potentials remained high, photosynthesis and stomatal conductance decreased at midday. The midday depression in gas exchange was not reversed by short-term ...

Benzoapyrene (B[a]P) pollution poses a threat to the environment and food chain consequently human health. However, alleviation of harmful effects B[a]P in perennial ryegrass ( Lolium perenne L.) by application exogenous nitric oxide (NO) has been ignored. Thus, this paper sodium nitroprusside (SNP, NO donor) on growth, photosynthetic fluorescence characteristics, antioxidant enzyme activity ex...

Four evergreen broadleaf Rhododendron spp. (Rhododendrons), namely, aganniphum, R. nyingchiense, wardii, and triflorum, occur in harsh subalpine habitats the southwest Qinghai-Tibet Plateau (QTP), China. Considering that four Rhododendrons cannot escape their unique environment, they must evolve a set of adaptations to survive, but information is lacking. To uncover physiological adaptation cha...

We investigated sex-related photosynthetic responses to drought in the dioecious species, Populus cathayana Rehd. Plants were subjected to two watering regimes (100% and 30% of field capacity) in a semi-controlled environment. Drought significantly decreased leaf area (LA), total number of leaves (TNL), specific leaf area (SLA), relative water content, net photosynthetic rate (P(n)), transpirat...

The photosystem II (PSII) light-harvesting antenna in higher plants contains a number of highly conserved gene products whose function is unknown. Arabidopsis thaliana plants depleted of one of these, the CP24 light-harvesting complex, have been analyzed. CP24-deficient plants showed a decrease in light-limited photosynthetic rate and growth, but the pigment and protein content of the thylakoid...

The cyanobacterium Synechococcus sp. PCC 7942 possesses a small psbA multigene family that codes for two distinct forms of the photosystem II reaction-center protein D1 (D1:1 and D1:2). We showed previously that the normally predominant D1 form (D1:1) was rapidly replaced with the alternative D1:2 when cells adapted to a photon irradiance of 50 mumol.m-2.s-1 are shifted to 500 mumol.m-2.s-1 and...