Table 5 Diagnostic indicators for the developmental morphology of young panicles in regenerative tillers
From: Brassinosteroid signaling may regulate the germination of axillary buds in ratoon rice
Developmental Stage | Dynamics of organ elongation | The length and age of leaf | Other diagnostic indicators | |
|---|---|---|---|---|
Tillers with three leaves | Tillers with four leaves | |||
①Initial stage of bract differentiation | Initial elongation of the top 3rd leaf | 0.6~1 cm (prophyll) | 4~5 cm (prophyll) | |
②Initial stage of primary branch differentiation | Obvious elongation of the top 3rd leaf | 2~3 cm (prophyll) | one mature leaf and one new leaf (1/10 of the mature leaf) | |
③Initial stage of secondary branch differentiation | Initial elongation of the top 2nd leaf | 4~5 cm (prophyll) | one mature leaf and one new leaf (5/10 of the mature leaf) | |
â‘£Initial stage of spikelet differentiation | Obvious elongation of the top 2nd leaf | one mature leaf and one new leaf (1/10 of the mature leaf) | two mature leaves and one new leaf (1/10 of the mature leaf) | |
⑤Initial stage of pistil and stamen differentiation | Initial elongation of the top 1st leaf | one mature leaf and one new leaf (5/10 of the mature leaf) | two mature leaves and one new leaf (5/10 of the mature leaf) | |
⑥Pollen mother cell and meiosis stage | Obvious elongation of the top 1st leaf sheath | two mature leaves and one new leaf (7/10 of the mature leaf) | three mature leaves and one new leaf (7/10 of the mature leaf) | The pulvinus distance of the top two leaves is -5 cm, spikelet length is 50%. |
⑦Initial stage of pollen filling | Initial elongation of the top 1st internode | three mature leaves | four mature leaves | The pulvinus distance of the top two leaves is 0 cm, spikelet length is 70%. |
⑧Initial stage of pollen maturity | Initial elongation of panicle neck internode | The panicle occipital interval is above-2 cm, the spike neck length is 5 cm | ||