Nitrogen and radiation effects during the active spike - growth phase on floret development and biomass partitioning in 2 - and 6 - rowed barley isolines
The paramount importance of accumulated biomass in active-growing spikes over the number of grains per unit area has been well documented. However, it is not clear how different nitrogen [N] and radiation supplies during the active spike-growth phase alter the dynamics of floret primordia initiation...
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| Lenguaje: | Inglés |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2010Arisnabarreta.pdf LINK AL EDITOR |
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| 245 | 0 | 0 | |a Nitrogen and radiation effects during the active spike - growth phase on floret development and biomass partitioning in 2 - and 6 - rowed barley isolines |
| 520 | |a The paramount importance of accumulated biomass in active-growing spikes over the number of grains per unit area has been well documented. However, it is not clear how different nitrogen [N] and radiation supplies during the active spike-growth phase alter the dynamics of floret primordia initiation and survival to establish the number of fertile florets and grains in 2- and 6-rowed barley. The objective of this paper was to evaluate how biomass and N partitioned between vegetative and reproductive organs alter the development of potential grains [i.e. floret primordia], when 2- and 6-rowed barley is grown under different radiation and N levels during their active spike-growth phase. A field experiment was carried out using two near-isogenic lines differing in the spike type and grown under contrasting radiation and N levels around the active spike-growth phase. Floret primordia development and biomass and N partitioning towards vegetative and reproductive organs were analysed. The results showed significant genotype X radiation X N level interactions on the dynamics of generation and abortion of reproductive structures. Under non-limiting N conditions, reductions in radiation levels strongly reduced the number of differentiated florets, although the effects were higher in 6- than in 2-rowed barley types. The higher the N supply, the higher the floret development stage reached when the spikes started growing at their maximum growth rates, increasing floret survival in that way. A threshold of floral development could not be found at any time in the crop cycle that guaranteed a fertile floret stage at heading. As it was not possible to identify a direct effect of N on the establishment of fertile florets, the efforts for further rising yield potential in barley should be focused on processes influencing partitioning of assimilates to reproductive growth during the critical period. | ||
| 653 | 0 | |a BIOMASS PARTITIONING | |
| 653 | 0 | |a FERTILE FLORETS | |
| 653 | 0 | |a MALTING BARLEY | |
| 653 | 0 | |a NITROGEN | |
| 653 | 0 | |a RADIATION | |
| 653 | 0 | |a BARLEY | |
| 653 | 0 | |a BIOLOGICAL DEVELOPMENT | |
| 653 | 0 | |a BIOMASS ALLOCATION | |
| 653 | 0 | |a FERTILIZER APPLICATION | |
| 653 | 0 | |a GROWTH RATE | |
| 653 | 0 | |a IRRADIATION | |
| 653 | 0 | |a PHYTOMASS | |
| 653 | 0 | |a REPRODUCTIVE STATUS | |
| 653 | 0 | |a SURVIVAL | |
| 653 | 0 | |a VEGETATIVE PROPAGATION | |
| 653 | 0 | |a YIELD RESPONSE | |
| 653 | 0 | |a HORDEUM | |
| 700 | 1 | |9 6438 |a Miralles, Daniel Julio | |
| 773 | |t Crop and Pasture Science |g Vol.61, no.7 (2010), p.578-587 | ||
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| 900 | |a ^tNitrogen and radiation effects during the active spike-growth phase on floret development and biomass partitioning in 2- and 6-rowed barley isolines | ||
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| 900 | |a ^aMiralles^bD. J. | ||
| 900 | |a ^aArisnabarreta^bS.^tDepartamento de Producción Vegetal, Facultad de AgronomÃa, Universidad de Buenos Aires, Av. San Martn 4453 [C1417DSE], Buenos Aires, Argentina | ||
| 900 | |a ^aMiralles^bD.J.^tBIFEVA, Facultad de AgronomÃa, Universidad de Buenos Aires, Av. San MartÃn 4453 [C1417DSE], Buenos Aires, Argentina | ||
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| 900 | |a Vol. 61, no. 7 | ||
| 900 | |a 587 | ||
| 900 | |a BIOMASS PARTITIONING | ||
| 900 | |a FERTILE FLORETS | ||
| 900 | |a MALTING BARLEY | ||
| 900 | |a NITROGEN | ||
| 900 | |a RADIATION | ||
| 900 | |a BARLEY | ||
| 900 | |a BIOLOGICAL DEVELOPMENT | ||
| 900 | |a BIOMASS ALLOCATION | ||
| 900 | |a FERTILIZER APPLICATION | ||
| 900 | |a GROWTH RATE | ||
| 900 | |a IRRADIATION | ||
| 900 | |a PHYTOMASS | ||
| 900 | |a REPRODUCTIVE STATUS | ||
| 900 | |a SURVIVAL | ||
| 900 | |a VEGETATIVE PROPAGATION | ||
| 900 | |a YIELD RESPONSE | ||
| 900 | |a HORDEUM | ||
| 900 | |a The paramount importance of accumulated biomass in active-growing spikes over the number of grains per unit area has been well documented. However, it is not clear how different nitrogen [N] and radiation supplies during the active spike-growth phase alter the dynamics of floret primordia initiation and survival to establish the number of fertile florets and grains in 2- and 6-rowed barley. The objective of this paper was to evaluate how biomass and N partitioned between vegetative and reproductive organs alter the development of potential grains [i.e. floret primordia], when 2- and 6-rowed barley is grown under different radiation and N levels during their active spike-growth phase. A field experiment was carried out using two near-isogenic lines differing in the spike type and grown under contrasting radiation and N levels around the active spike-growth phase. Floret primordia development and biomass and N partitioning towards vegetative and reproductive organs were analysed. The results showed significant genotype X radiation X N level interactions on the dynamics of generation and abortion of reproductive structures. Under non-limiting N conditions, reductions in radiation levels strongly reduced the number of differentiated florets, although the effects were higher in 6- than in 2-rowed barley types. The higher the N supply, the higher the floret development stage reached when the spikes started growing at their maximum growth rates, increasing floret survival in that way. A threshold of floral development could not be found at any time in the crop cycle that guaranteed a fertile floret stage at heading. As it was not possible to identify a direct effect of N on the establishment of fertile florets, the efforts for further rising yield potential in barley should be focused on processes influencing partitioning of assimilates to reproductive growth during the critical period. | ||
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