Vine Growth and Yield Response of Alphonse Lavallée (V. Vinifera L.) Grapevines to Plant Growth Promoting Rhizobacteria Under Alkaline Condition in Soilless Culture

Abstract

High carbonate content in soil negatively affect plant growth, because the availability of nutrients is restricted due to high pH. The present investigations were carried out to reveal possible alleviating effects of the exogenous root inoculation PGPRs on development and physiology of soilless-grown grapevines cultivated under alkaline stress in controlled glass house. pH of growth medium was increased from 7.5 to the values ranging from 7.9 (control) to 8.1 (A18) according to the bacterial inoculations by NaHCO 3 supplementations. Bacteria inoculations did not result in statistically significant differences in pH values of growth media. The bacterial population density found in the rhizosphere of grapevines ranged from 6 × 10 8 CFU mL −1 (M-3) to 9 × 10 8 CFU mL −1 (Ca-637). The highest value of shoot thickness was obtained from Ca-637 (5.3 mm), followed by A18 (5.2 mm), while M3 did not significantly affected the shoot thickness. The greatest pruning residue per vine was obtained from A18 treatment (81.5 g), followed by Ca-637 (80.8 g) while the lowest value was determined in control. Vine yield was the greatest with A18 (1128 g) treatment and was followed by Ca 637 (1059 g). Considering the general observations, root inoculation of PGPRs A18 and Ca-637 may be recommended in enhancing bioremediation of alkali growth media.

Changes in air Water Vapour Pressure, Relative Humidity and Carbon Dioxide Concentration in Summer on the City Outskirts

“…Transpiration is also highly correlated with current microclimatic conditions, e.g. irradiance and temperature [Sabir and Yazar, 2015;Konarska et al, 2016]. At the leaf level, transpiration rates are controlled both physiologically by stomatal conductance and physically by gas exchange between leaves and the surrounding air [Winbourne et al, 2020].…”

“…When plants receive enough amounts of water, a correlation between transpiration and VPD exists [Tan et al, 2020]. Midday high temperature and high vapour pressure deficit often result in decrease in stomatal conductance and, consequently in transpiration at noon and/or early afternoon due to temporal drought stress in leaf tissues caused by insufficient water supply from roots [Tuzet et al, 2003;Sabir et al, 2015;Yan et al, 2016]. This contributes to the diurnal pattern of water vapour pressure.…”

“…A typical pattern of photosynthetic activity of plants shows the highest performance at mid-day. However, high solar radiation and high temperature in hot summer days may force plants to close their stomata in order to avoid water stress in plant tissues and photodamage of photosynthetic apparatus [Sabir andYazar, 2015, Martin-StPaul et al, 2017]. This results in depletion of transpiration rate and CO 2 assimilation.…”

Application of biostimulant products and biological control agents in sustainable viticulture: A review

“…(2003) observed Bacillus strains BAI6 and OSU142 increased rooting in 41B (a hardy cross between old-word V. vinifera and new-world V. berlandieri ) rootstocks. Similarly, Sabir (2013) and Sabir et al. (2017) applied P. putida BA-8 and B. simplex T7 to 41B hybrids and recorded a promotion of graft callusing, scion shoot growth, nursery survival rate, and fruitfulness.…”

“…Köse et al (2003) observed Bacillus strains BAI6 and OSU142 increased rooting in 41B (a hardy cross between old-word V. vinifera and new-world V. berlandieri) rootstocks. Similarly, Sabir (2013) and Sabir et al (2017) applied P. putida BA-8 and B. simplex T7 to 41B hybrids and recorded a promotion of graft callusing, scion shoot growth, nursery survival rate, and fruitfulness. Salomon et al (2016) tested a combination of strains B. licheniformis and P. fluorescens in order to improve the growth of V. vinifera cultivar 'Malbec' in greenhouse conditions.…”