Abstract
Field experiments were conducted at Coimbatore, India to study the effect of three levels of drought (severe, moderate and no drought) during the formative phase (60–150 days after planting; DAP) of sugarcane on the tillering, the conversion of shoots to millable canes, cane attributes and the quality of different classes of shoots in four sugarcane cultivars (Co 8021, Co 419, Co 8208 and Co 6304)_the different classes of shoots studied were: mother shoots (which emerged 0–30 DAP), early tillers (30–60 DAP), mid‐season tillers (60–150 DAP) and late tillers (150 DAP). The results indicated that drought during the formative phase reduced the total number of shoots and their conversion to millable canes at harvest. Drought also reduced the cane length, number of inter‐nodes and single cane weight of different classes of shootsand the subsequent total cane yield. Irrespective of drought treatments, Co 8021, a high‐tillering, thick‐stalked cultivar, gave the highest cane yield despiteits higher shoot mortality, while Co 8208, a low‐tillering, thin‐stalked cultivar, gave the lowest cane yield despite its lower shoot mortality. Thus a moderate level of shoot mortality is clearly necessary to obtain higher millable canes and subsequently higher cane yield. Mother shoots and early tillers together contributed most of the total number of millable canes (84.5 %) and of the total cane yield at harvest (86.2 %). The contribution of late tillers to the number of millable canes and cane yield was, however, negligible, especially in cultivars Co 6304 and Co 8208. There was a gradual reduction in stalk attributes such as cane length, number of internodes, single cane weight and commercial cane sugar percentage as the physiological age of shoots decreased. This study emphasizes the need for a cultivar with the optimal characteristics of early tillering (like Co 8021 and Co 6304) and maximum conversion to millable canes (like Co 8208) and provides information relevant to breeders making decisions on crossing programmes to produce improved cultivars for drought conditions.
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Claims 12
Claim · model-written summary
Formative drought reduced total shoots and conversion to millable canes.
- Taxon
- Sugarcanet0
- Treatment
- drought during the formative phasee0
- Outcome
- total number of shoots and their conversion to millable canese0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“drought during the formative phase reduced the total number of shoots and their conversion to millable canes at harvest.”
t0“Sugarcane”
Claim · model-written summary
Drought reduced cane length, internode number and single cane weight.
- Taxon
- Sugarcanet0
- Treatment
- Droughte0
- Outcome
- cane length, number of inter‐nodes and single cane weighte0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Drought also reduced the cane length, number of inter‐nodes and single cane weight of different classes of shoots”
t0“Sugarcane”
Claim · model-written summary
Drought reduced total cane yield.
Not reportedComparator
Verbatim
e0“Drought also reduced the cane length, number of inter‐nodes and single cane weight of different classes of shootsand the subsequent total cane yield.”
t0“Sugarcane”
Claim · model-written summary
Co 8021 had the highest cane yield despite greater shoot mortality.
Verbatim
e0“Co 8021, a high‐tillering, thick‐stalked cultivar, gave the highest cane yield despiteits higher shoot mortality”
t0“Sugarcane”
Claim · model-written summary
Co 8208 had the lowest cane yield despite lower shoot mortality.
Verbatim
e0“Co 8208, a low‐tillering, thin‐stalked cultivar, gave the lowest cane yield despite its lower shoot mortality.”
t0“Sugarcane”
Claim · model-written summary
Moderate shoot mortality was interpreted as necessary for more millable canes and yield.
Verbatim
e0“a moderate level of shoot mortality is clearly necessary to obtain higher millable canes and subsequently higher cane yield.”
t0“Sugarcane”
Claim · model-written summary
Mother shoots and early tillers provided 84.5% of millable canes.
Verbatim
e0“Mother shoots and early tillers together contributed most of the total number of millable canes (84.5 %)”
t0“Sugarcane”
Claim · model-written summary
Mother shoots and early tillers provided 86.2% of cane yield.
Verbatim
e0“Mother shoots and early tillers together contributed most of the total number of millable canes (84.5 %) and of the total cane yield at harvest (86.2 %).”
t0“Sugarcane”
Claim · model-written summary
Late tillers contributed negligibly to millable canes and yield.
Verbatim
e0“The contribution of late tillers to the number of millable canes and cane yield was, however, negligible, especially in cultivars Co 6304 and Co 8208.”
t0“Sugarcane”
Claim · model-written summary
Cane length, internodes and weight declined with decreasing shoot age.
Verbatim
e0“There was a gradual reduction in stalk attributes such as cane length, number of internodes, single cane weight and commercial cane sugar percentage as the physiological age of shoots decreased.”
t0“Sugarcane”
Claim · model-written summary
Commercial cane sugar percentage declined with decreasing shoot age.
Verbatim
e0“There was a gradual reduction in stalk attributes such as cane length, number of internodes, single cane weight and commercial cane sugar percentage as the physiological age of shoots decreased.”
t0“Sugarcane”
Claim · model-written summary
The study recommends crossing for early tillering and conversion to millable canes under drought.
Verbatim
e0“This study emphasizes the need for a cultivar with the optimal characteristics of early tillering (like Co 8021 and Co 6304) and maximum conversion to millable canes (like Co 8208)”
t0“Sugarcane”
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