Abstract
The growth and photosynthesis of Oncidium Goldiana, a popular tropical orchid for cut flower production, have been studied. Four main developmental stages of Oncidium Goldiana vert identified: bud stage, plantlet stage, unsheathing stage and pseudobulb stage. Pseudobulb formation occured during the unsheathing stage which was closely followed by the formation of inflorescence. The pseudobulb of Oncidium Goldiana is of heterblastic type and lacks stomata.Oncidium Goldiana is a C3 shade plant based on Cb1 a/b ratio, CO2 compensation point, postillumination CO2 outburst and light saturation. The rate of photosynthesis increased with the development of the inflorescence and auxillary bud. Pseudobulbs contain chlorophyll but show no sign of gas exchange in light and dark. However it fixes CO2 in light with the partial removal of cuticle.
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