[Source function supression on effects on carbonate distribution and frost resistance of winter wheat vegetative plants]
2008
Klimov, S.V. | Burakhanova, E.A. | Dubinina, I.M. | Alieva, G.P. | Salnikova, E.B. | Olinechienko, N.A. | Zagoskina, N.V. | Trunova, T.I., Russian Academy of Sciences, Moscow (Russian Federation). The K.A. Timiryazev Institute of Plant Physiology
The influence of source function supression on physiological properties of winter wheat (Triticum aestivum) was under study. The plants of the variety Mironovskaya 808 were grown in water culture, they were in mixotrophic growth stage at their transition from vegetation state to relative rest state. Daily average temperature during 10 days of experiment was 6 deg C, photoperiod was 9 hours at an illumination level of 8-20 000 lx. The source function was gradually decreased in the follow test samples: 1 - intact plants, 2 - with deleted seed endosperm, 3 - with isolation of photosynthesis, 4 - with deleted seed endosperm + isolation of photosynthesis, 5 - with deleted seed endosperm + isolation of photosynthesis + distilled water instead of nutrient solution. Relative growth rate (RGR) was measured according plant dry weight and its distribution through organs, CO2-change (photosynthesis and dark respiration) speed on the 6-10th day of the experiment. Sugar content (saccharose + glucose + fructose) and correlation, phenol compound and flavonoid amount, membrane stability index (MSI) in the leaves and frost resistance were also determined. It is showed that frost resistance of the vegetative plants has the inverse relationship with RGR (r = -0.906), dark respiration speed (r = -0.789), saccharose percentage in sugar amount (r = -0.737), MSI in the leaves (r = -0.390), photosynthesis intensity (r =-0.288) and the direct correlation with flavonoid content (K=0.973), phenol (K=0.743) compound and sugar (K= 0.385) amount. Source-sink relationships of frost resistance at the stage of transition of vegetative plants to hardening, differences between these plants and those resistance to cold, the role of phenol compounds for frost resistance development are discussed.
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