Life Cycle of Rice Plant
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Transcript of Life Cycle of Rice Plant
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CSISA 1
CEREAL SYSTEMS INITIATIVE FOR SOUTH ASIA (CSISA)
7 June 2011, IRRI Office, Dhaka
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Phases and stages of rice plant
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3 Phases:1. Vegetative phase2. Reproductive phase3. Ripening phase
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Ripening phase-: 30 days,Reproductive phase: 30 daysRest part vegetative phase
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Growth phases of rice plant (Varietals differences)
Vegetative Phase100 days
Reproductive Phase
30 days
Ripening Phase
30 days
BRRI dhan29(160 days)
Vegetative Phase80 days
ReproductivePhase
30 days
RipeningPhase
30 days
BRRI dhan28(140 days)
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Impact of temperature on growth phases (BR 3)
Vegetative Phase110 days
Reproductive30 days
Ripening30 days
Boro(170 days)
Vegetative Phase70 days
Reproductive30 days
Ripening30 days
Aus(130 days)
Vegetative Phase85 days
Reproductive30 days
Ripening30 days
T. Aman(145 days)
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Vegetative phase
Basic vegetative phase: Lag vegetative/ photosensitive phase
• Period of this stage: Generally 35-65 days. However, some varieties it takes 20 days and some other takes 85 days
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Photoperiod sensitive rice
PI depends on day length
Takes more time after completing of basic vegetative phase
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Example of photosensitivity
Photo insensitive Veg. Rep. Ripen. 13 hrs day
Veg. Rep. Ripen 11 hrs day
Photo insensitive/ photosensitive Veg. Rep Ripen. 13 hrs day
Veg. Rep. Ripen. 11 hrs dayActive
Lag
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Stages of Rice1. Germination stage:
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Coleorhiza starts before coleoptile
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But coleoptile comes out earlier than coleorhiza
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Soaking for 24-48 hrs and incubation for 24-72 hrs: germinattion occurs
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Seedling stage
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Seedling stage: germination to 5 leaf stage
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Leaf number and tiller relationship
X leaf -3 (L-3)
1-3 = -2 (no tiller)
2-3 = -1 (no tiller)
3-3 = 0 (no tiller)4-3 = 1 (no probability for tillering as leaf 1 is
not fully expanded)
5-3 = 2 (Tiller from 2 node)
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In 200 c, 5 days/leaf In 250 c, 4 days/leaf
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Transplanting stage
Transplanting to establishment In T. Aus and T. Aman 5-7 days In Boro 10-15 days 0 day in DSR
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Tillering stage
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Stem elongation stage
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Not visible up to 9 days1.0 t0 1.5 mm after 10 days
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Panicle development
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Female organs
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Male organs
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Pollination
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Flowering at different parts of panicle
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•
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90-100 % paddy hard and yellow colouy
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Leaf died
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Intercultural operations at different stages of rice life cycle
• Weeding
• Fertilizer
• Irrigation
• Yield is the function of number of panicle, filled spikelet and
mean individual grain weight
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CSISA 49