Titanium dioxide nanoparticles model growth kinetic traits of some wheat cultivars under different water regimes
2019
Dawood, Mona F. A. | Abeed, Amany H. A. | Aldaby, Eman E. S.
Deficit irrigation affected drastically growth kinetics and leaves traits with variant degrees drawing the tolerance or sensitivity of four wheat cultivars which recorded from pre- to post-anthesis stage. The main susceptibility characters of hypersensitive cultivar Sohag 3 were reduction of photosynthetic efficiency (chlorophyll and photosynthetic rate), leaf greenness (low leaf area index; LAI), accelerated leaf aging (low biomass duration; BMD and leaf area duration; LAD), thinner and lighter leaves (high specific leaf area; SLA and high leaf area ratio; LAR) which dramatically reflected on low net assimilation rate; NAR and unit leaf rate; ULR, hence diminished absolute growth rate; AGR and relative growth rate; RGR, the vice versa was displayed by the most tolerant cultivar Seds 12. Intermediated response was manifested by cultivars Benisuif 5 and Sakha 93, since the former was close in response to cultivar Seds 12 and the latter showed the main characters of cultivar Sohag 3 but in lower degree. The photo-catalytic property of TiO₂-NPs seemingly accomplished improvement of leaves and growth kinetics traits by fertigation the soil of wheat cultivars growing at different water regimes. TiO₂-NPs fertigation promoted leaf characteristics through production of thicker and heavier leaves as well as promoting leaf longevity by enhancement of BMD and LAD. Thus, TiO₂-NPs activated production of vigor and well-constructed leaves with higher chlorophyll and photosynthetic rate thereby, high LAI, hence higher values of RGR, AGR, ULR and NAR.
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