Abstract
Ratoon sugarcane plantlets in southern China have suffered a serious chlorosis problem in recent years. To reveal the causes of chlorosis, plant nutrition in chlorotic sugarcane plantlets and the role of manganese (Mn) in this condition were investigated. The study results showed that the pH of soils growing chlorotic plantlets ranged from 3.74 to 4.84. The symptoms of chlorosis were similar to those of iron (Fe) deficiency while the chlorotic and non-chlorotic plantlets contained similar amount of Fe. Chlorotic plantlets had 6.4-times more Mn in their leaf tissues compared to the control plants. There was a significantly positive correlation between Mn concentration in the leaves and the exchangeable Mn concentration in the soils. Moreover, leaf Mn concentration was related to both seasonal changes in leaf chlorophyll concentration and to the occurrence of chlorosis. Basal stalks of mature sugarcanes contained up to 564.36 mg·kg(-1) DW Mn. Excess Mn in the parent stalks resulted in a depress of chlorophyll concentration in the leaves of sugarcanes as indicated by lower chlorophyll concentration in the leaves of plantlets emerged from basal stalks. Ratoon sugarcane plantlets were susceptible to chlorosis due to high Mn accumulation in their leaves (456.90-1626.95 mg·kg(-1) DW), while in planted canes chlorosis did not occur because of low Mn accumulation (94.64-313.41mg·kg(-1) DW). On the other hand, active Fe content in chlorotic plantlets (3.39 mg kg(-1) FW) was only equivalent to 28.2% of the concentration found in the control. These results indicate that chlorosis in ratoon sugarcane plantlets results from excessive Mn accumulated in parent stalks of planted cane sugarcanes grown on excessive Mn acidic soils, while active Fe deficiency in plantlets may play a secondary role in the chlorosis.
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Claims 13
Claim · model-written summary
Soils growing chlorotic sugarcane plantlets had pH 3.74 to 4.84.
Verbatim
e0“pH of soils growing chlorotic plantlets ranged from 3.74 to 4.84”
t0“Sugarcane Plantlets”
Claim · model-written summary
Chlorotic and non-chlorotic plantlets had similar iron amounts despite symptoms resembling iron deficiency.
Verbatim
e0“symptoms of chlorosis were similar to those of iron (Fe) deficiency while the chlorotic and non-chlorotic plantlets contained similar amount of Fe”
t0“Sugarcane Plantlets”
Claim · model-written summary
Chlorotic plantlets had 6.4 times more leaf manganese than controls.
Verbatim
e0“Chlorotic plantlets had 6.4-times more Mn in their leaf tissues compared to the control plants”
t0“Sugarcane Plantlets”
Claim · model-written summary
Leaf manganese concentration correlated positively with exchangeable soil manganese.
Verbatim
e0“significantly positive correlation between Mn concentration in the leaves and the exchangeable Mn concentration in the soils”
t0“Sugarcane Plantlets”
Claim · model-written summary
Leaf manganese concentration related to seasonal changes in leaf chlorophyll concentration.
- Taxon
- Sugarcane Plantletst0
- Compound
- leaf Mn concentratione0
- Outcome
- seasonal changes in leaf chlorophyll concentratione0
Not reportedDirection
Verbatim
e0“leaf Mn concentration was related to both seasonal changes in leaf chlorophyll concentration and to the occurrence of chlorosis”
t0“Sugarcane Plantlets”
Claim · model-written summary
Leaf manganese concentration related to chlorosis occurrence.
Not reportedDirection
Verbatim
e0“leaf Mn concentration was related to both seasonal changes in leaf chlorophyll concentration and to the occurrence of chlorosis”
t0“Sugarcane Plantlets”
Claim · model-written summary
Mature basal stalks contained up to 564.36 mg·kg(-1) DW manganese.
Verbatim
e0“Basal stalks of mature sugarcanes contained up to 564.36 mg·kg(-1) DW Mn”
Claim · model-written summary
Excess manganese in parent stalks depressed leaf chlorophyll concentration in emerging plantlets.
Verbatim
e0“Excess Mn in the parent stalks resulted in a depress of chlorophyll concentration in the leaves of sugarcanes as indicated by lower chlorophyll concentration in the leaves of plantlets emerged from basal stalks”
Claim · model-written summary
Ratoon plantlet leaves accumulated 456.90-1626.95 mg·kg(-1) DW manganese and were susceptible to chlorosis.
Verbatim
e0“Ratoon sugarcane plantlets were susceptible to chlorosis due to high Mn accumulation in their leaves (456.90-1626.95 mg·kg(-1) DW)”
Claim · model-written summary
Planted canes had low manganese accumulation of 94.64-313.41mg·kg(-1) DW and no chlorosis.
Verbatim
e0“in planted canes chlorosis did not occur because of low Mn accumulation (94.64-313.41mg·kg(-1) DW)”
t0“Sugarcane Plantlets”
Claim · model-written summary
Chlorotic plantlets had active iron content of 3.39 mg kg(-1) FW.
Verbatim
e0“active Fe content in chlorotic plantlets (3.39 mg kg(-1) FW) was only equivalent to 28.2% of the concentration found in the control”
t0“Sugarcane Plantlets”
Claim · model-written summary
Active iron content in chlorotic plantlets was 28.2% of control concentration.
Verbatim
e0“active Fe content in chlorotic plantlets (3.39 mg kg(-1) FW) was only equivalent to 28.2% of the concentration found in the control”
t0“Sugarcane Plantlets”
Claim · model-written summary
Authors attribute ratoon sugarcane chlorosis primarily to manganese accumulated in parent stalks and secondarily to active iron deficiency.
Verbatim
e0“chlorosis in ratoon sugarcane plantlets results from excessive Mn accumulated in parent stalks of planted cane sugarcanes grown on excessive Mn acidic soils, while active Fe deficiency in plantlets may play a secondary role in the chlorosis”