A polyethylene glycol based medium for in vitro germination of cashew pollen

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Abstract
A medium, comprising polyethylene glycol 4000, sucrose, boron, and calcium, for in vitro germination of pollen in cashew (Anacardium occidentale L.) gave 90–95% germination as well as excellent pollen tubes comparable with those found in vivo. The better performance of this combination compared with media containing only sucrose and inorganic elements is discussed in relation to the superiority of polyethylene glycol to sucrose as an osmoticum.