Behavioral responses of leaves and vascular cambium ofProsopis cineraria(L.) Druce to different regimes of coal-smoke pollution

Abstract

The foliar and cambial responses of Prosopis cineraria to five different coal-smoke regimes in Delhi, India, were studied using the monthly collections of leaves and cambial blocks as well as the data on SO 2 , NO 2 and particulate concentrations from each of the five study sites. Coal-smoke inhibited pigment concentration, NR activity and sugar content and promoted stomatal index and the nitrate and sulfur contents. Stomatal conductance was low, leading to a drop in the net photosynthetic rate. Cambial activity started quite late and the annual increment of wood was reduced despite a prolonged active phase, possibly due to a distinctly retarded rate of cambial cell division. Vessel proportion in the wood increased but the size of vessel elements and fibers decreased. Such studies may help in identifying trees suitable for cultivation in the pollutionaffected areas.

The influence of rainfall and temperature on radial growth of urban trees under the impact of steel industry pollution

“…It is worth mentioning that the retention of pollution occurs as a function of urban size, atmospheric stability, and the intensity and flow of winds (Takebayashi and Senoo 2018;Yun et al 2020;Abbassi et al 2022), these considered as the main mechanism that results in greater deposition of particles in trees (Chen et al 2015). At the same time, the vegetation that makes up urban afforestation is subject to greater stress and can undergo changes in its structure (Rai 2016), such as morphological or anatomical parameters of the leaves (Alves et al 2008;Costa et al 2015), in cellular metabolic processes (Sytar 2013) in periods of cambial activity and dormancy (Iqbal et al 2010a(Iqbal et al , 2010bVasconcellos et al 2017), or even in xylem anatomy and radial increment (Leonelli et al 2012;Chagas 2013;Pretzsch et al 2017;Vasconcellos et al 2019;Vasconcellos and Callado 2020). In this way, the task of interpreting dendroclimatic reconstructions, for example, can be aided by investigating the influences of non-climatic sources (Fang et al 2015).…”