Sugar accumulation in winter wheat crops depending on the sowing dates

The object of the research was to study the influence of sowing dates on sugar accumulation in different varieties of soft winter wheat. Less winterhardy variety of soft winter wheat Novosibirskaya 2 was compared with more winter-hardy ones Novosibirskaya 3, Novosibirskaya 40 and Krasnoobskaya ozimaya. The research was carried out in 2016-2018 inthe established experimental plot in the foreststeppe of Priobye, theObregion. The predecessor was bare fallow. The planting dates were August 20, September 1, September 10. Weather conditions of the autumn growing season, during which the accumulation of sugars occurs, differed significantly depending on the year of study and the sowing dates. The warmest conditions were in 2018, whereas the coolest – in 2017. The amount of accumulated sugars varied depending on the growing conditions and genotypic characteristics of varieties. The highest amount of sugars was accumulated by all varieties during the third term of planting, the lowest amount – during the second term. Lower air temperatures contributed to the increase in the amount of sugars, even when the duration of their accumulation period was shortened, which can be explained by a change in carbohydrate balance in crops when the accumulation of sugars is greater than their consumption for crop respiration. The genotype plays an important role in the carbohydrate metabolism of plants. In more winter-hardy varieties (Novosibirskaya 40, Novosibirskaya 3), the change in the amount of accumulated sugars in contrasting conditions ranged insignificantly (the coefficient of variation was 9.1 and 8.7%, respectively). At the same time, plants of the less winter-hardy variety of Novosibirskaya 2 showed a significantly greater variation in the sugar content under similar conditions (the coefficient of variation 24.7%). Cooler conditions of a later term of sowing contributed to the greatest amount of accumulated sugars. Varietal differences also determined changes in carbohydrate balance.

1. Tumanov I.I. Fiziologicheskiye osnovy zimostoykosti kul’turnykh rasteniy [Physiological basis of winter hardiness of cultivated plants]. Sel’khozgiz. Leningradskoye otdeleniye [Agriculture. Leningrad branch], 1940, 366 p. (In Russian).

2. Tumanov I.I. Fiziologiya zakalivaniya i morozostoykosti rasteniy [Physiology of hardening and frost resistance of plants]. M.: Nauka Publ., 1979, 350 p. (In Russian).

3. Dorofeyev N.V., Peshkova A.A., Voynikov V.K. Ozimaya pshenitsa v Irkutskoy oblasti [Winter wheat in Irkutsk region], Irkutsk: ArtPress [Art-Press], 2003, 175 p. (In Russian).

4. Borisenkov YU.P., Medvedev A.M., Novikova M.V., Gordeyeva T.N. Zimostoykost’ i produktivnost’ ozimoy pshenitsy v usloviyakh Povolzh’ya [Winter hardiness and productivity of winter wheat in the Volga region]. Byulleten’ VIR [Bulletin VIR], 1978, vol. 84, pp. 37–40. (In Russian).

5. Sandukhadze B.I., Rybakova M.I., Morozova Z.A. Nauchnyye osnovy selektsii ozimoy pshenitsy v nechernozemnoy zone Rossii [Scientific basis for the selection of winter wheat in the non-chernozem zone of Russia]. M.: MGIU [MGIU], 2003, 426 p. (In Russian).

6. Bondarenko V.I., Klimov A.N., Gogibidze K.D., Vetrogonva K.Z. Zimostoykost’, uglevodnyy obmen i produktivnost’ ozimoy pshenitsy [Winter hardiness, carbohydrate metabolism and winter wheat productivity]. Byulleten’ VNII kukuruzy [Bulletin of the Research Institute of Maize], 1988, no. 2, pp. 32–36. (In Russian).

7. Borovik O.A., Grabel’nykh O.I., Korolova N.A., Pobezhimova T.P., Voynikov V.K. Svyaz’ mezhdu Aktivnost’yu Al’ternativnogo puti dykhaniya, soderzhaniyem sakharov i morozoustoychivost’yu ozimoy pshenitsy [The relationship between the activity of the alternative path of respiration, sugar content and frost resistance of winter wheat]. Zhurnal stressfiziologii i biokhimii [Journal of Stress Physiology & Biochemistry], 2013, vol. 9, no. 4, pp. 241–250. (In Russian).

8. Kruzhilin A.S., Shvedskaya Z.M. Fiziologiya vyprevaniya ozimykh v usloviyakh nechernozem’ya [Physiology of asphyxiation of winter crops in the conditions of non-chernozem] Byulleten’ VIR [Bulletin VIR], 1980. vol. 119, pp. 49–54. (In Russian).

9. Trunova T.I. Sakhara kak odin iz faktorov, povyshayushchikh morozostoykost’ rasteniy [Sugars as one of the factors that increase the frost resistance of plants]. Izvestiya AN SSSR. Seriya biologicheskaya [News of the Academy of Sciences of the USSR. Biological series], 1972, no. 2, pp. 185–196. (In Russian).

10. Karmanenko N.M., Bukhareva N.S. Vliyaniye usloviy mineral’nogo pitaniya na soderzhaniye rastvorimykh uglevodov i aminokislot u razlichnykh po zimostoykosti sortov ozimoy pshenitsy [Influence of the conditions of mineral nutrition on the content of soluble carbohydrates and amino acids in winter wheat varieties different in winter-hardiness]. Trudy VNII udobreniy i agropochvovedeniya [Proceedings of the Institute of Fertilizers and Soil Science], 1981, no. 60. pp. 101–106. (In Russian).

11. Poltarev Ye.M., Zolochevskaya V.D. Dinamika sakharov u poliploidnykh zlakov razlichnoy zimostoykosti v period zimovki [Dynamics of sugars in polyploid cereals of various winter hardiness during the wintering period]. Metody i priyemy povysheniya zimostoykosti ozimykh zernovykh kul’tur [Methods and techniques for increasing the winter hardiness of winter cereals]. M.: Kolos Publ., 1975, pp. 399–404. (In Russian).

12. Borzhkovskaya G.D., Usova T.K. K voprosu o fiziologo-biokhimicheskikh osnovakh zimostoykosti ozimykh [On the issue of physiological and biochemical bases of winter-hardiness of winter crops]. Fiziologicheskiye osnovy povysheniya ustoychivosti rasteniy i polevoy vskhozhesti semyan v Sibiri [Physiological basis of increasing plant resistance and field germination of seeds in Siberia]. M.: Nauka Publ., 1967, pp. 3–10. (In Russian).

13. Biglov T.T. O zakalivanii ozimykh rasteniy v svyazi s ikh vozrastnym sostoyaniyem i protsessami yarovizatsii [On hardening of winter plants in connection with their age condition and the process of vernalization]. Fiziologicheskiye osnovy povysheniya ustoychivosti rasteniy i polevoy vskhozhesti semyan v Sibiri [Physiological basis for increasing the resistance of plants and field germination of seeds in Siberia]. Nauka Publ., 1967, pp. 21–26. (In Russian).

14. Shevchuk O.G. Otsenka razlichnykh sortov i gibridov ozimoy pshenitsy v zavisimosti ot srokov poseva i norm vyseva [Evaluation of different varieties and hybrids of winter wheat, depending on the time of sowing and seeding rates]. Voprosy zemledeliya i rasteniyevodstva [In collection: Issues of agriculture and plant growing]. Irkutsk, 1967, pp. 33–35. (In Russian).

15. Torikov V.Ye., Mel’nikova O.V., Bogomaz R.A. Nakopleniye sakharov v uzlakh kushcheniya sortov ozimoy pshenitsy, urozhaynost’i kachestvo zerna [Sugar accumulation in tillering nodes of winter wheat varieties, yield and grain quality]. Niva Povolzh’ya [Niva Povolzh’ya], 2015, no. 2, pp. 69–73. (In Russian).