Effects of plant growth regulators on seed productivity of maize lines

Рurpose and objectives. To study the influence of growth regulators on seed productivity seeding quality development maternal forms, pollen-forming ability parental forms corn hybrids, as well to develop ways using in primary stages production. Material methods. The experiments were conducted crop rotation fields Plant Production Institute named after V.Ya. Yuriev NAAS 2018-2019. Seeds maize lines sown with manual planters six-row plots 29.4 m2 (arrangement 4♀:2♂), four replications. Phenological observations biometric measurements performed 10 plants each replication. Eight – hybrids’ parents taken test material: 4 steryl counterparts (Kharkivska 126 M, Kharkivska 215 164 155 M) sterility maintainers ZM, Kharkiv ZM). There treatments: 1) no treatment (control); 2) Appetizer - spraying phase 4-5 leaves; 3) Nertus Planta Peg pre-sowing treatment; 4) + leaves. stigma viability was determined by sequential removal plastic bags. evaluate accession performance, following parameters recorded: plant number per plot; infertile number; undeveloped cobs; complete cobs. One average quantitative sample cobs (10 cobs) weighed for drying analyzing cob structure. Results discussion. In counterparts, a significant weight condition observed before tassel emergence onset. best response PGRs M ZM. After 2 (Appetizer), we noted greatest surplus comparison corresponding control plots. PGR-treated plots, flowering occurred later stigmas appeared earlier, which reduced gap between anthesis male female lines. Line showed synchrony experiment (Appetizer) time almost coincided (♂ 27/07 ♀ 28/07). 3 (Nertus seeds) seeds spraying) peaks both 27/07-♀ 27/07), however, stopped much earlier than ones: there an (as 03/08 2% ♂ 43% flowered). We recorded increase kernel sample, 1000-kernel weight, total yield other indices ones. Nevertheless, treatments (Appetizer, Nertus, +) influenced pollen maintainers. had effect Of sterile analogues, PGR M. It less noticeable Conclusions. results regulator effectiveness allow us recommend improvers 1st generation parents.