Stigmatic receptivity of peach flowers submitted to heat stress

Abstract

Because of climatic changes, the cultivation of temperate climate plants such as peach in subtropical climates has become a challenge. In these areas, temperatures exceeding 25°C often occur during the pre-flowering and flowering phases. The high temperature causes damages by acting during the early stages of pollen-pistil interaction processes. The objective of this work was to evaluate the stigmatic receptivity of peach flowers at 18°C and 30°C. The pollen adherence was evaluated as well as the germination and presence of pollen tubes in the transmitting tissue of the style. The genotypes responded differently to temperature. ‘Granada,’ ‘Diamante’, and ‘Sensação’ had a stigmatic receptivity that was less affected when flowers were exposed to the higher temperature. Most genotypes showed a reduction in the number of pistils with pollen tubes growing in the style, particularly when pollination was delayed.

Viability and receptivity of reproductive structures in Lima bean (Phaseolus lunatus L.) for improvement programs

“…In addition to pollen viability, flower receptivity plays a crucial role in the dynamics of pollination, reproductive success, and consequently fruit production since the stigma is the first surface of the pistil to come into contact with the pollen grain (Carpenedo et al, 2020). In this region, the formation of bubbles resulting from contact with hydrogen peroxide is observed in response to several enzymes that characterize the receptive stigma (Figure 3B), such as dehydrogenases and esterases (Shivanna & Rangaswamy, 1992;Zulkarnain et al, 2019).…”

The neglected other half ‐ role of the pistil in plant heat stress responses

“…Both pollination and fertilization processes are extremely sensitive to heat stress. For instance, heat stress decreased the number of pollen grains that adhered to the stigmatic surface affecting pollen receptivity in different plant species (Arabidopsis [ Arabidopsis thaliana ], 40/21°C, Katano et al, 2019; chickpea, 40/30°C and 45/35°C, Kumar et al, 2013; peach [ Amygdalus persica L.], 30°C, Carpenedo et al, 2020; wheat, 35/25°C, Prasad & Djanaguiraman, 2014). In canola, increased temperature shortened the stigma nectar secretion period, which contributed to a gradual decrease in effectiveness of the pollinator‐based pollination (Chabert et al, 2018).…”

“…Studies are referenced according to the crop, with numbers in parenthesis in the legend aligned with the number and related change listed above in the grey box. Crops and related references: tomato—[1] (Pan et al, 2017); [8] (Mareri et al, 2016); [9] (Liu, Offler, & Ruan, 2016); rice—[2] (Wu et al, 2019); [13] (Jiang et al, 2020); [14] ( Zhang, Li, Chen, et al, 2018); chickpea—[3] (Kumar et al, 2013); wheat—[4] (Prasad & Djanaguiraman, 2014); arabidopsis—[5] (Katano, Oi, & Suzuki, 2019); peach—[6] (Carpenedo, Bassols, Franzon, Byrne, & Silva, 2020); canola—[7] (Chabert, Lemoine, Cagnato, Morison, & Vaissière, 2018); cotton—[10] (Loka & Oosterhuis, 2016); [11] (Snider, Oosterhuis, Skulman, & Kawakami, 2009); [12] (Snider, Oosterhuis, Loka, & Kawakami, 2011a); pea—[15] (Savada, Ozga, Jayasinghege, Waduthanthri, & Reinecke, 2017); pearl millet—[16] (Djanaguiraman, Perumal, Ciampitti, et al, 2018). AGP, Arabinogalactan Proteins; ROS, Reactive Oxygen Species [Colour figure can be viewed at wileyonlinelibrary.com]…”