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Growth regulators and mowing heights enhance the morphological and physiological performance of Seaspray turfgrass during drought conditions

100%

Elansary H. O. , Yessoufou K.

Acta Physiologiae Plantarum

2015

tom 37

nr 11

With the unusually prolonged drought that results from climate change, increasing the ability of plants to resist drought become a necessity. The objectives of this study were to investigate the effects of two plant growth regulators [(trinexapac-ethyl (TE) and abscisic acid (ABA)], three mowing heights (MH) (25, 35 and 45 mm), and four irrigation levels of 30, 50, 70, and 100 % of the daily evapotranspiration (ET) on the turf performance of seashore paspalum [Paspalum vaginatum (Swartz)] grown in PVC container under greenhouse conditions. After 10 weeks of water regimes and MHs initiation, the application of TE/ABA increased turf quality (TQ), leaf photochemical efficiency (Fv/Fm), maximum root length (MRL) and dry weight (RDW), total nonstructural carbohydrates (TNC), and Ca and K contents but reduced ET under drought conditions. Increasing MH increased TQ, ET, Fv/Fm, MRL, RDW, TNC, and proline as well as leaves K and Ca under drought conditions. The co-application of TE/ABA and higher MH will significantly alleviate the negative effects of drought and maintain acceptable quality in Seaspray at 50 % ET. Osmotic adjustment, the accumulation of carbohydrates and protective effects of TE/ABA on photosynthetic efficiency play a major role in drought resistance in ‘Seaspray’.

DNA barcoding reveals micro-evolutionary changes and river system-level phylogeographic resolution of African silver catfish, Schilbe intermedius (Actinopterygii: Siluriformes: Schilbeidae) from seven populations across different African river

80%

Van der Bank H. F. , Greenfield R. , Daru B. H. , Yessoufou K.

Acta Ichthyologica et Piscatoria

2012

tom 42

nr 4

Background. Under the tropics, less than 40% of known fishes are identified to species-level. Further, the ongoing global change poses unprecedented threat to biodiversity, and several taxa are likely to go extinct even before they could be described. Traditional ecological theory suggests that species would escape extinction risk posed by global threats (e.g., climate change) only by migrating to new environments. In this study, we hypothesise that micro-evolutionary changes (evolution within species and populations) are also important mechanisms for the survival of Schilbe intermedius in Africa, a continent subjected to uneven distribution of climate severity. Materials and Methods. Using the mitochondrial cytochrome c oxidase subunit I (COI) gene, known as animal DNA barcode, we tested this hypothesis by analysing the genetic diversity and phylogenetic relations between seven populations of S. intermedius across different African river systems. Results. We reveal a clear geographical patterning in genetic variations, with three clear clusters (southern Africa, eastern Africa, and western Africa). In southern Africa, the South African population is distinct from that of Namibia and Botswana. In addition, within Nigerian populations of silver catfish, two sub-clusters emerged from two isolated river systems. We suggest that the phylogeographic pattern within African silver catfish populations mirror the past effects of selection and gene flow, and that the split within Nigerian silver catfish populations might be the result of micro-evolutionary adaptive responses to local selection pressures. Conclusion. We suggest that the strong genetic difference in African silver catfish among geographically isolated river systems might be the result of in situ micro-evolutionary adaptive responses to changing environments, and that DNA barcode has potential beyond species delimitation.

Physiological and molecular characterization of water-stressed Chrysanthemum under robinin and chitosan treatment

61%

Elansary H. O. , Abdel-Hamid A. M. E. , Yessoufou K. , Al-Mana F. A. , El-Ansary D. O. , Mahmoud E. A. , Al-Yafrasi M. A.

Acta Physiologiae Plantarum

2020

tom 42

nr 03