Photosynthetic acclamatory response of Panicum antidotale Retz. populations to root zone desiccation stress

Abstract

Growth of plants is severely reduced due to water stress by affecting photosynthesis including photosystem II (PSII) activity and electron transport. This study emphasised on comparative and priority targeted changes in PSII activity due to progressive drought in seven populations of Panicum antidotale (P. antidotale) collected from Cholistan Desert and non-Cholistan regions. Tillers of equal growth of seven populations of P. antidotale grown in plastic pots filled with soil were subjected progressive drought by withholding water irrigation for three weeks. Progressive drought reduced the soil moisture content, leaf relative water content, photosynthetic pigments and fresh and dry biomass of shoots in all seven populations. Populations from Dingarh Fort, Dingarh Grassland and Haiderwali had higher growth than those of other populations. Cholistani populations especially in Dingarh Grassland and Haiderwali had greater ability of osmotic adjustment as reflected by osmotic potential and greater accumulation of total soluble proteins. Maximum H2O2 under water stress was observed in populations from Muzaffargarh and Khanewal but these were intermediate in MDA content. Under water stress, populations from Muzaffargarh and Dingarh Fort had greater K+ accumulation in their leaves. During progressive drought, non-Cholistani populations showed complete leaf rolling after 23 days of drought, and these populations could not withstand with more water stress condition while Cholistani populations tolerated more water stress condition for 31 days. Moreover, progressive drought caused PSII damages after 19 days and it became severe after 23 days in non-Cholistani populations of P. antidotale than in Cholistani populations.

Unravelling mechanisms of CaO nanoparticle-induced drought tolerance inBrassica napus: an analysis of metabolite and nutrient profiling

“…39 The optimal method for evaluating PSII efficacy involves measurements of PSII activity through OJIP analysis or induction curve analysis of plants grown under controlled and stressed conditions 40 and typically exhibits a strong correlation with plant biomass. 41 In contrast, CaO NPstreated plants grown under drought stress exhibited a substantial increase in Φ Pav (Fig. 2F), which is analogous to previous studies in which it was demonstrated that a 50 mg L −1 GO application increased the quantum yield of PSII (F v / F m ) and the actual efficiency of PSII in droughted Aloe vera plants.…”

Harnessing nanobiotechnology for drought stress: transforming agriculture's future; what, why and how?

“…Drought is widely recognized as a prominent environmental factor that significantly affects agricultural productivity on a global scale. 3 Plant movement and absorption of nutrients may be limited under conditions of low water content, which can have a subsequent impact on several metabolic processes, such as hormone regulation and chlorophyll production, as well as the timing of phenological events and nutrient acquisition. 4 Unexpectedly, plants already have low use efficiencies for macronutrients (<50%) when the soil is usually wet 5 which is worsened by drought, lowering fertilizer efficacy even further.…”

ROLE OF PHOTOSYSTEM II ACTIVITY IN SALT TOLERANCE OF Panicum antidotale AND Panicum turgidum: INSIGHTS FROM CHLOROPHYLL A FLUORESCENCE ANALYSIS ON EXCISED LEAF

“…Semiquantitative analysis of OJIP curves were performed in MS Excel. In addition, JIP-test parameters were extracted from raw curves following (Strasser et al, 2000;Javed et al, 2021b). The data for JIP-test was subjected to two-way analysis of variance (ANOVA).…”