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Timing and Correlation of Major Developmental Events in Maize, Zea mays L.¹

Timing and sequence of major developmental events were studied in Corn Belt dent inbred lines and hybrids,with two dates of planting and two growing seasons. Mean developmental characterizations and sequences were established both for quantitative and qualitative events. The number of days from planting to a given event was greatly influenced by genotype. Hybrids developed faster than corresponding inbred fines in all respects except the full achievement of kernels per row potential; hybrids produced significantly more kernel primordia per row. Developmental differences attributable to planting date or growing season appeared to leflect effects of air temperature, soil moisture, or both. Low temperature and moisture deficiency apparently retarded development. Internode elongation, axillary bud development and cessation of ear elongation proceeded acropetally, while ear initiation was basipetal. Four pairs of events were closely related in time: (1) tassel initiation and the beginning of stalk elongation, (2) top car initiation and beginning of rapid stalk elongation, (3) accelerated tassel peduncle elongation and tassel emergence, and (4) accelerated top ear elongation and attainment of maximum top ear kernels per row potential. Important physiological relationships may exist betweeu these related events.

Key Words: tassel initiation • ear initiation • anthesis • silking

² Assistant Agronomist, Mountain Meadow Research Center, Colorado State University, Grand Junction, Colo. (until August 1969, Assistant Scientist, University of Tennessee, UT-AEC AgE Res. Lab., 1299 Bethel Valley Rd., Oak Ridge, Tenn. 37830) and Professor of Plant Breeding and Genetics and Professor Emeritus of Plant Morphology, University of Illinois, respectively,

Received for publication February 5, 1968.

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