2022
DOI: 10.3390/agronomy12010225
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Heat Stress Leads to Poor Fruiting Mainly Due to Inferior Pollen Viability and Reduces Shoot Photosystem II Efficiency in “Da Hong” Pitaya

Abstract: High summer temperatures (day/night: 40 °C/30 °C) are known to cause poor fruiting, reduced fruit/seed weight, and delayed fruit development in the “Da Hong” red-fleshed pitaya (Hylocereus polyrhizus); however, the mechanisms of these effects are unknown. This study examined how high temperature (HT, 40 °C/30 °C) affects stamen and pistil fertility through pollination combinations and fruit set in “Da Hong” pitaya and evaluated photosystem II (PSII) efficiency in yellowed shoots (cladodes). The in-vitro pollen… Show more

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Cited by 9 publications
(2 citation statements)
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“…3. Pollen seen under the microscope through a computer (3A= 0% from 19:00. to 20:00.; 3B= 50% from 01:00; 3C=95% from 02:00-04:00; 3D=63%, at 05:00) On the other hand, Chu & Chang [19] observed that temperatures higher than 30°C delay the opening time of the flower, as well as its closing, which also affects the viability of the pollen. The data from this study support this statement, since, although the two materials began anthesis from 18:35 and 19:00, the average temperatures recorded were 35.8 and 35.5°C respectively (Figure 4).…”
Section: Resultsmentioning
confidence: 97%
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“…3. Pollen seen under the microscope through a computer (3A= 0% from 19:00. to 20:00.; 3B= 50% from 01:00; 3C=95% from 02:00-04:00; 3D=63%, at 05:00) On the other hand, Chu & Chang [19] observed that temperatures higher than 30°C delay the opening time of the flower, as well as its closing, which also affects the viability of the pollen. The data from this study support this statement, since, although the two materials began anthesis from 18:35 and 19:00, the average temperatures recorded were 35.8 and 35.5°C respectively (Figure 4).…”
Section: Resultsmentioning
confidence: 97%
“…ikewise, Ni et al [21], found that pollen viability and pollen tube length in pitahayas with white and red pulp decreased in storage at 30°C, so temperature affects both variables. Chu & Chang [19] found that high temperatures affect the viability of pollen and impact the productivity of Hylocereus.…”
Section: Resultsmentioning
confidence: 99%