Modification of the Sink/Source Relationships in Bread Wheat and its Influence on Grain Yield and Grain Protein Content*

Borghi, B.; Corbellini, M.; Cattaneo, M.; Fornasari, Maria Emanuela; Zucchelli, L.

doi:10.1111/j.1439-037x.1986.tb00073.x

Cited by 39 publications

(20 citation statements)

References 15 publications

(10 reference statements)

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“…Therefore, the common explanation that a higher number of grains m −2 reduces assimilate availability per individual grain may be true if source limitations occur during grain filling. Yet, wheat, particularly under optimum conditions, has been reported to be sink limited (Borojevic, 1979; Thorne et al, 1979; Borghi et al, 1986; Bindraban, 1997). In the case of barley, TKW is higher than in wheat even when number of grains m −2 is the same and the duration of grain filling is shorter (Richards, 1996).…”

Section: Resultsmentioning

confidence: 99%

Agronomic Potential of Synthetic Hexaploid Wheat‐Derived Populations

2001

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Wild relatives of wheat (Triticum aestivum L.) have primarily been used as sources of genes for biotic and abiotic stress resistance. A more direct approach to grain yield improvement has been sought by using exotic germplasm to enhance quantitative traits, including grain yield. This study was conducted to determine whether synthetic hexaploids, developed from artificial hybridization of durum wheat [Triticum turgidum ssp. durum (Desf.) Husn.] with Aegilops tauschii Coss., can enhance yield or yield components of wheat. Two hundred eighty‐two BC2F2‐derived lines, involving six crosses between different synthetic hexaploids and four spring wheat cultivars, were evaluated for grain yield and its components. These synthetic‐derived lines were compared with their recurrent parent in field experiments conducted during the 1995 to 1996 and 1996 to 1997 crop seasons near Ciudad Obregón, Sonora, Mexico. More than 80% of the synthetic‐derived lines were significantly superior to their recurrent parent for kernel weight. Eight lines had significantly higher grain yield compared with their recurrent parent. Grain yields of superior lines were up to 11% higher than those of their recurrent parents. A strong association between grains m−2, biomass, spikes m−2, and grain and biomass production rates and grain yield was observed in all populations. Path coefficient analyses of yield components revealed a strong direct effect of spikes m−2 and grains spike−1 on grain yield. Results indicate that synthetic hexaploids can be a valuable source of alleles to improve kernel weight.

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Section: Resultsmentioning

confidence: 99%

Agronomic Potential of Synthetic Hexaploid Wheat‐Derived Populations

2001

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“…2b). The findings that hybrid wheats show positive correlations between protein content and total biomass (Corbellini and Borghi 1985;Borghi et al 1986) and produce large amounts of dry .t-irt'-i"t-)it'\"r1t'l"rf l"r"lir'1i"r""",F .fr*t1i"tl?",'.'."t-">l','"r"$r",1"r";'ir. "",F PERFoRMANCT (Z) baking characteristics.…”

Section: Methodsmentioning

confidence: 99%

Combining ability for breadmaking quality in wheat

Perenzin¹,

Pogna²,

Borghi³

1992

Can. J. Plant Sci.

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. 1992. combining ability for breadmaking quality in wheat. Can. J. Plant . Combining ability and heterotic patterns for grain yieiO, teinet weight, and seven traits related to breadmaking quality were determined in 45 F, hybrid wheats and l8-parents grown in two environments in Italy. Significant, positive general combining ability (GCA) effects were observed for yield (cultivars Pandas and SK 7), protein content (Salmone) and for the alveograph parameters ofdough strength W (Pandas, Saliente and Salmone), tenacity P (Irnerio, Kosutka and Saliente) and extensibility L (Pandas, Salgemma and Salmone). Although best-parent heterotic responses for yield were generally low (5 10%), they were evident at all levels of yield potential. Hybrid wheats tended to have high protein content, enhanced clough extensibility and weak gluten compared with the parents. However, a few hybrid combinations from crosses between high-yielding culiivars and good-quality cultivars had both good yield levels () 7 t ha I) and acceptable breadmaking properties (W > 250, P/L < l). Significant

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“…The number of grains m 2 is more associated with grain yield than individual grain weight under different environmental conditions and cultivars (Fischer, 1985;Caldiz & Sarand6n, 1988;Slafer & Andrade, 1989a& 1991Savin & Slafer, 1991), because wheat grain yield is normally sink-limited during the grain filling period (Perez & MartinezCarrasco, 1985;Borghi et al, 1986;Savin & Slafer, 1991); although some source limitation has recently been suggested (Grabau et al, 1990;Ma et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

Changes in physiological attributes of the dry matter economy of bread wheat (Triticum aestivum) through genetic improvement of grain yield potential at different regions of the world

1991

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The understanding of the changes produced by plant breeding on wheat grain yield and on its determinants, through the study of the behaviour of cultivars released at different times during the breeding process, could be a useful tool to define future selection criteria. The aim of this paper was to examine the genetic improvement effects on bread wheat grain yield potential and on its major physiological determinants in different countries.Generally, it seems that the genetic improvement produced important increases in harvest index, but it did not produce important changes in total biomass. The genetic gain in grain yield ranged from 0.58 g m 2 year 1 (India) to 5.84 g m 2 year 1 (Mexico); reflecting important differences among genetic improvement programmes. However, when the comparisons were made in relative values, the difference was much lower, ranging from 0.16% year -1 to 0.90% year ~, for the previously mentioned countries, respectively. Most of the regions showed relative genetic gains of around 0.45% year 1. Similar patterns of relative genetic gains in harvest index were found.Half of the total gain in grain yield in the past was due to genetic gain in grain yield potential. However, it is expected for the future, that further increases in grain yield will rely more on genetic gain than on technologic gain. Thus, a discussion about possible strategies in future breeding programmes of bread wheat is attempted throughout the paper.The changes in grain yield were mostly associated with changes in number of grains per m 2 rather than with changes in individual grain weight. It appears that the source:sink ratio during the grain-filling period was very high in old cultivars, whereas the source:sink ratio in modern cultivars is more balanced. Further increases in number of grains m 2 could be compensated by a reduction in individual grain weight, if simultaneous improvement in source strength during grain-filling is not achieved. 38The crop attributes which have been changed together with the mentioned traits are discussed and alternative selection criteria are suggested.

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Modification of the Sink/Source Relationships in Bread Wheat and its Influence on Grain Yield and Grain Protein Content*

Cited by 39 publications

References 15 publications

Agronomic Potential of Synthetic Hexaploid Wheat‐Derived Populations

Agronomic Potential of Synthetic Hexaploid Wheat‐Derived Populations

Combining ability for breadmaking quality in wheat

Changes in physiological attributes of the dry matter economy of bread wheat (Triticum aestivum) through genetic improvement of grain yield potential at different regions of the world

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