Abstract Diatomaceous earth is an organic naturally occurring material rich in silicon. This silicon source can be used in organic agriculture, it also has a great potential of use in the acclimatization of crops. However, there are no reports of the effects of diatomaceous earth supplementation on the micropropagation of sweet potato. Thus, the objective of this study was to evaluate the effects of different concentrations of diatomaceous earth applied in vitro on the growth, physiology and anatomy of sweet potato cv. ‘Brazlândia Branca’ after acclimatization. Four concentrations of diatomaceous earth. After 30 days of in vitro growth, the plants were transferred to a greenhouse for acclimatization. After 45 days, leaf number, shoot and root length, fresh and dry shoot and root mass, gas exchange, chlorophyll content, root and leaf anatomy. The experimental design was completely randomized. The supplementation of diatomaceous earth in the in vitro cultivation had beneficial effects, increasing the accumulation of mass, improving the photosynthetic apparatus and promoting favorable anatomical characteristics during the acclimatization of the sweet potato plants. In addition, the use of diatomaceous earth achieved adequate seedling development, with higher seedling quality and resistance to biotic and abiotic effects than attained with control treatment. agriculture crops However Thus growth cv Brazlândia Branca 3 4 number length mass exchange content randomized addition development treatment

Resumo O objetivo deste trabalho foi avaliar as características florais e físico-químicas do fruto de plantas da cultivar BRS Pérola do Cerrado de maracujazeiro silvestre (Passiflora setacea D.C.), bem como sua relação com os fatores climáticos locais. Foram avaliados o pico de florescimento; o tempo em dias do aparecimento floral até à antese e, em seguida, até à colheita dos frutos; a morfometria floral; os horários de abertura e de fechamento das flores; a ocorrência de autopolinização natural; de geitonogamia e de incompatibilidade floral; a característica físico-química dos frutos e a relação com as variáveis climáticas. Nas condições deste estudo, foi observado que o pico de florescimento ocorreu no mês de novembro e que o horário de abertura das flores variou de 19 horas e 21 minutos a 20 horas e 40 minutos ao longo do ano, provavelmente influenciado pela radiação solar diária; enquanto o horário de fechamento das flores ocorreu entre 6 e 8 horas. As flores, após seu fechamento, não apresentaram recorrência de abertura floral. As flores da espécie Passiflora setacea cv. BRS Pérola do Cerrado são autoincompatíveis e não possibilitam a geitonogamia, e confirma-se, portanto, para que haja formação de frutos, a necessidade de polinização cruzada. Quanto ao pegamento de frutos nos diferentes métodos de polinização, as taxas foram de 34,6% quando foram feitas de forma artificial e de 53,5% quando houve polinização natural. Os frutos apresentaram, em média, diâmetro longitudinal de 4,9 cm, diâmetro transversal de 4,6 cm e massa fresca de 55 g, volume de suco de 15,7 mL por fruto, 13,31º Brix e acidez total titulável de 1,7 g/100g ác. cítrico.

Abstract This work aimed to evaluate the floral and physicochemical characteristics of passion fruits BRS Pérola do Cerrado cultivar (Passiflora setacea D.C.), as well as its relationship with local climatic factors. Peak flowering, time in days of floral appearance until anthesis and until fruits harvest, floral morphometry, time of flower opening and closing, occurrence of natural self-pollination, geitonogamy and floral incompatibility, physicochemical characteristics of fruits and relationship with climatic variables were evaluated. Under the conditions of this study, it was observed that the flowering peak occurred in November and the time of flower opening ranged from 7:21 pm to 8:40 pm throughout the year, probably influenced by daily solar radiation; while the time of flower closing occurred between 6:00 am and 8:00 pm. After closing, flowers showed no recurrence of floral opening. Flowers of Passiflora setacea species BRS Pérola do Cerrado cultivar are self-incompatible and do not allow geitonogamy. Therefore, for fruit formation, cross-pollination is necessary. Regarding fruit setting in the different pollination methods, rates were 34.6% when artificially made and 53.5% in case of natural pollination. Fruits had, on average, longitudinal diameter of 4.9 cm, cross-sectional diameter of 46 mm and fresh mass of 55 g, juice volume of 15.7 ml per fruit, 13.31 ° Brix and total titratable acidity of 1.7 g / 100g ac. citric.