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| Differences in low-K tolerance， photosyntheticcharacteristics and antioxidant enzymesystem between different sugarcane genotypes |
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| Abstract: |
| A…hydroponic…experiment…was…conducted…to…investigate…the…differences…of…low-K…tolerance…ability，
photosynthetic…characteristics， chlorophyll…fluorescence…parameters…and…antioxidant…indexes…between…Yuetang…60
（YT60）and…BC2-32， a…progeny…of…Erianthus arundinaceus.…The…results…showed…that…there…was…decline…with…59.39%…in…
dry…weight…of…BC2-32…under…low…K…stress， while…only…30.61%…for…YT60， indicating…that…YT60…was…more…tolerant…to…low…
K…stress…than…BC2-32.…Under…low…K…stress， the…decline…of…leaf…chlorophyll…content， net…photosynthetic…rate（Pn）and…
maximum…photochemical…efficiency（Fv/Fm）was…less…and…the…increase…of…SOD…activity， proline…and…malondialdehyde
（MDA）content…was…also…less…for…YT60…compared…to…BC2-32， which…demonstrated…that…the…photosynthetic…
characteristics…and…related…indexes…of…the…antioxidant…enzyme…system…could…be…used…as…the…indicators…for…screening…
sugarcane…genotype…with…low…K…tolerance. |
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