EFFECT OF TEMPERATURE ON INFLORESCENCE DEVELOPMENT AND FLORAL BIOLOGY OF MANGO (MANGIFERA INDICA L.)

N. Sukhvibul, S.E. Hetherington, A.W. Whiley, M.K. Smith, V. Vithanage
Trees of two mono-embryonic (‘Irwin’ and ‘Sensation’) and two poly-embryonic (‘Nam Dok Mai’ and ‘Kensington’) mango cultivars were exposed to winter temperatures to induce flowering. They were subsequently transferred into controlled environment glasshouse rooms under day/night temperature regimes of 15/5, 20/10, 25/15 and 30/20°C for 20 weeks.

Inflorescence development only occurred on trees that were maintained at 20/10, 25/15 and 30/20°C. Higher temperatures generally increased the inflorescence size while there was an inverse effect on the mean number of flowers per inflorescence with 619.6 at 20/10°C decreasing to 431.3 at 30/20°C. There was an inverse relationship between the length of the anthesis period and temperature. Low temperatures at 20/10°C decreased the percent hermaphrodite flowers in poly-embryonic cultivars but increased the percentages in mono-embryonic cultivars. Style length and stigma width was reduced when the trees were held at 20/10°C compared to those trees held at either 25/15 or 30/20°C. Trees of ‘Kensington’ grown at 20/10°C mainly produced flowers which had short styles (0.62 mm) and small stigmatic surfaces while ‘Nam Dok Mai’ and ‘Irwin’ trees produced some flowers which had deformed ovaries or fused ovaries. A decrease in percent hermaphrodite flowers and floral changes which occur in poly-embryonic cultivars when inflorescences develop under low temperatures (20/10°C), are likely factors contributing to their low fruit set when grown in subtropical climates.

Sukhvibul, N., Hetherington, S.E., Whiley, A.W., Smith, M.K. and Vithanage, V. (2000). EFFECT OF TEMPERATURE ON INFLORESCENCE DEVELOPMENT AND FLORAL BIOLOGY OF MANGO (MANGIFERA INDICA L.). Acta Hortic. 509, 601-608
DOI: 10.17660/ActaHortic.2000.509.68
https://doi.org/10.17660/ActaHortic.2000.509.68
floral morphology, pollen viability, sex expression, mango

Acta Horticulturae