Abstract
High-precision IR gasometry and pulse-amplitude modulated fluorometry were used under field conditions to study photosynthetic CO2 exchange, transpiration (H2O release), and the light stage of photosynthesis in intact fully expanded leaves of 15 varieties of topinambour (Helianthus tuberosus L.). At the end of the growth period, fresh weights of the root system and tubers were determined. Water delivery from the roots to shoots was found to be the limiting factor for photosynthetic gas exchange. The results also showed the proportional relationship (R 2 = 0.88) between the weight of root system and tuber crop productivity. It is concluded that the root system plays the primary role in variety-specific features of water supply to leaves in topinambour plants: the root system was the rate-limiting factor of photosynthesis and accounted eventually for different productivities of tuber crops. Based on the results obtained, the fresh root weight indicative of root system development is recommended as a useful trait in breeding for plants with a high yield of topinambour tubers.
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Abbreviations
- A :
-
CO2 exchange under light
- E :
-
leaf transpiration
- F v/F m :
-
maximal quantum yield of PSII activity estimated by PAM fluorometry
- NPQ:
-
non-photochemical quenching of PSII chlorophyll fluorescence
- PAM:
-
pulse-amplitude modulation
- PSII:
-
photosystem II
- qP :
-
photochemical quenching of PSII chlorophyll fluorescence
- WUE:
-
water use efficiency
- Yield:
-
effective quantum yield of PSII operation
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Original Russian Text © G.P. Fedoseeva, P.Yu. Voronin, R.I. Bagautdinova, 2015, published in Fiziologiya Rastenii, 2015, Vol. 62, No. 2, pp. 244–248.
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Fedoseeva, G.P., Voronin, P.Y. & Bagautdinova, R.I. Leaf photosynthesis and tuber crop productivity in topinambour plants. Russ J Plant Physiol 62, 224–228 (2015). https://doi.org/10.1134/S1021443715020065
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DOI: https://doi.org/10.1134/S1021443715020065