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REVIEW & INTERPRETATION

A Survey of Factors Involved in Crop Maturity

USDA-ARS, Crop Genetics and Production Research Unit, Box 345, Stoneville, MS 38776. Trade names are used in this publication solely for the purpose of providing specific information. Mention of a trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by the USDA-ARS and does not imply approval of the named product to the exclusion of other similar products

^* Corresponding author (arnold.bruns{at}ars.usda.gov).

The time necessary for crops to successfully complete reproduction is species and environment dependent. Lifecycles can be completed in a few weeks or take several years depending on the plant species. Crop development is divided into phenophases that are affected primarily by light and temperature changes, interacting with phytohormones. Some species are influenced more by light and others by temperature. This review focuses on factors that influence maturation in several important agronomic crops.

Abbreviations: DNP, day-neutral plant • GDD, growing degree day • GDU, growing degree unit • LDP, long-day plant • MG, maturity group • P_fr, phytochrome far-red • P_r, phytochrome red • SDP, short-day plant

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Received for publication August 13, 2007.