Morphological, physiological and productivity response in garden pea genotypes during high temperature stress

Abstract

Changes in morphological characteristics, productivity and fluorescence emission parameters at normal and high temperature values under field conditions of 10 varieties and lines of the species Pisum sativum L. from the collection of MARITSA Vegetable Crops Research Institute were established. The influence of high temperature on the condition and functional activity of the photosynthetic apparatus (PSA) was studied by analyses of chlorophyll fluorescence characteristics of photosystem II (PSII) in the pea leaves. Plants were subjected to stress from high temperature during the reproductive period (bud formation-flowering phases), which is considered particularly critical for pea plants. The morphological performances and productivity have been influenced by climatic characteristics of the years. The screening for thermostability of the photosynthetic apparatus to the high temperature characterizes Skinado, Faboundo and line 95/4 as the most tolerant on the basis of analysis of fluorescence induction parameters. The most sensitive are lines 72/2 and 72/9. Varieties of Skinado and Fabundo respond with higher yields of green pods and grains in the conditions of the first year, categorized as hot compared to 2013. We consider that the indicated accessions are suitable for the pea-breeding programme to high temperature stress tolerance.

Photosynthetic responses of Eulophia dentata, Bletilla formosana, and Saccharum spontaneum under various photosynthetic photon flux density conditions

“…In full sun-exposed habitats, leaves often absorb considerably more photons than can be utilized, the excess absorbed energy often resulting in reducing the photochemical efficiency of PSII (ΦPSII). Photoinhibition of photosynthesis occurs when PPFD exceeds the capacity/activity of the photosynthetic electron transport chain in the chloroplast, leading to the inactivation of and damage to PSII (Orekhova et al 2021); in addition, at high temperatures, plants absorb excess light energy and inhibit photosynthesis (Colom et al 2003, Kalapchieva et al 2019. Furthermore, excessively high irradiance may result in photoinhibition, which is characterized by a loss of PSII activity and a light-dependent reduction, thus requiring the dissipation of excess excitation energy (Portela et al 2019).…”

Taxonomic implication of leaf epidermal anatomy of selected taxa of Scrophulariaceae from Pakistan

“…Species boundaries are very important to understand the taxonomy of any group of plants (Ellstrand and Schierenbeck, 2000; Liti et al, 2006; Prendergast et al, 1993). The morphological and foliar epidermal anatomy is an important tool for the identification of different plant groups (Barykina and Alyonkin, 2018; Antipin and Choob, 2019; Barykina and Alyonkin, 2019; Kalapchieva et al, 2019; Vastag et al, 2019). Thus, the main purpose of this research work is to study the anatomical characters of the selected species of Scrophulariaceae from Pakistan and to define the species boundaries and provide a key for each species based on foliar epidermal anatomical characteristics of these selected taxa.…”