Indução floral de limeiras ácidas 'Tahiti' submetidas a baixas temperaturas

Santos, Dierlei dos; Siqueira, Dalmo Lopes de; Cecon, Paulo Roberto

doi:10.1590/s0103-84782011000300006

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…The reduction of Fm characterizes quinone A reduction deficiency, which may be associated with the inactivation of PS II in the membranes of the thylakoids, affecting electron mobility between the photosystems (CRUZ et al, 2006). Santos et al (2011) describe that the increase in irradiance reduces the values of Fm. In these premises, the increase of F0 and the decrease of Fm represents damage to the PS II, that is, they represent luminous stress, compromising electron transfer activities, represented by Fv (Fm -F0), which, in turn, reduces photochemical efficiency.…”

Section: Discussionmentioning

confidence: 99%

PHOSPHATE FERTILIZATION AND SHADING ON THE INITIAL GROWTH AND PHOTOCHEMICAL EFFICIENCY OF Campomanesia xanthocarpa O. BERG.

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Espíndola

Santos

et al. 2020

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Campomanesia xanthocarpa O. Berg. (“Gabirobeira”, Myrtaceae) is a versatile fruit tree species native in Cerrado. Studies of mineral fertilization and luminous conditions with the species are incipient. Thus, the aim was to evaluate the initial growth and photochemical aspects in C. xanthocarpa cultivated under phosphate fertilization and shading levels. The experiment was carried out in plastic pots and the factors under study consisted of five doses of phosphorus: 0, 50, 100, 150 and 200 mg kg soil-1, and two shadings levels: 0% (full sun) and 50%. The treatments were arranged in a 5 x 2 factorial scheme, in a randomized block design, with four replications. The greatest growth characteristics occurred at 240 days after transplantation. The highest chlorophyll index was seen in shaded leaves. The highest values of variable and maximum chlorophyll-a fluorescence were with 10.8 and 11.6 mg P kg-1 in shaded environments, and with 120.0 and 81.81 mg P kg-1, under full sun. The highest photochemical efficiency in photosystem II (Fv/Fm) was under full sun with 33.33 mg P kg-1. The analysis of main components explained 78.82% of the remaining variability. The shaded C. xanthocarpa plants showed higher photochemical yields with the addition of low phosphorus doses. Phosphate fertilization contributed to the mitigation of photochemical damage in young plants of C. xanthocarpa cultivated under full sun.

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Section: Discussionmentioning

confidence: 99%

PHOSPHATE FERTILIZATION AND SHADING ON THE INITIAL GROWTH AND PHOTOCHEMICAL EFFICIENCY OF Campomanesia xanthocarpa O. BERG.

Silvério

Espíndola

Santos

et al. 2020

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Flush development in Tahitian lime

2013

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The relationship between the cycle of flush development and temperature is not well described for Tahitian lime, or citrus species in general. We pruned trees over 16 months in the humid subtropics of northern New South Wales (NSW), and monitored post-pruning flush development over two cycles, in terms of flush commencement and flowering. We also recorded temperatures over this period. The time from pruning to the emergence of the first post-pruning flush was correlated with mean daily temperature, with emergence being slower at cooler temperatures. Emergence times ranged from 11 to 39 days. The time between the commencement of the first and second flushes was also correlated with mean daily temperature, with slower development of the first flush at cooler temperatures. The duration of the first flush varied from 41 to 128 days. There was more flowering on the first than the second flush (16% of shoots versus 3%). There was no flowering on flushes that commenced in the warmer months, from November to March. The temperature threshold for flowering appeared to be at a mean daily temperature of ~20°C. Regressions between flush development and temperature were used to estimate the effects of climate warming from 1963–1971 to 2003–2011, using long-term temperature records. The warming decreased bud emergence time by 1.6 days in winter and 1 day in summer; and reduced the time from the first to the second flush by 11.8 days in winter and 9.2 days in summer. The results for Tahitian lime were similar to those for other recurrent flushing trees.

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