Comparison of gas exchange and chlorophyll fluorescence of low-potassium-tolerant and -sensitive soybean [Glycine max (L.) Merr.] cultivars under low-potassium condition

Li, X. -T.; Cao, P.; Wang, X. -G.; Cao, M. -J.; Yu, H. -Q.

Comparison of gas exchange and chlorophyll fluorescence of low-potassium-tolerant and -sensitive soybean [Glycine max (L.) Merr.] cultivars under low-potassium condition

2011

Li, X. -T. | Cao, P. | Wang, X. -G. | Cao, M. -J. | Yu, H. -Q.

The effects of potassium (K) deficiency on chlorophyll (Chl) content, photosynthetic gas exchange, and photosystem II (PSII) photochemistry during the seedling stage were investigated in two soybean [Glycine max (L.) Merr.] cultivars, low-K sensitive Tiefeng31 and low-K tolerant Shennong6. The cultivars were grown hydroponically in K-sufficient (KS) and K-deficient (KD) solutions. Photosynthetic gas exchange and Chl content in Tiefeng31 were severely affected by the low K condition, but were almost unaffected in Shennong6. This difference is in accordance with the PSII photochemistry in the plants, indicating that the photosynthetic apparatus of Shennong6 is more tolerant to low-K stress than that of Tiefeng31.

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