Sink Manipulation in Wheat: Compensatory Changes in Kernel Size

Ma, Yong-Zhan; MacKown, Charles T.; Sanford, David A. Van

doi:10.2135/cropsci1990.0011183x003000050028x

Cited by 47 publications

(12 citation statements)

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“…In this study, JN17, DF611, GY503, TA9818, HN341 and SJZ8 may be source limited cultivars, YN15, S7221 and W62036 may be sink limited cultivars. However, in no case was the compensation by increased grain weight sufficient to achieve the total grain weight of the intact plant (Ma et al 1990). Borrá s et al (2004 also showed growth of wheat grains is apparently more sink-than sourcelimited under most conditions.…”

Section: Resultsmentioning

confidence: 99%

Effect of Source-Sink Manipulation on Photosynthetic Characteristics of Flag Leaf and the Remobilization of Dry Mass and Nitrogen in Vegetative Organs of Wheat

Zhang

Sun

Hong

et al. 2014

Journal of Integrative Agriculture

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The photosynthetic characteristics of flag leaf and the accumulation and remobilization of pre-anthesis dry mass (DM) and nitrogen (N) in vegetable organs in nine wheat cultivars under different source-sink manipulation treatments including defoliation (DF), spike shading (SS) and half spikelets removal (SR) were investigated. Results showed that the SS treatment increased the photosynthetic rate (Pn) of flag leaf in source limited cultivar, but had no significant effect on sink limited cultivar. The SR treatment decreased the Pn of flag leaf. Grain dry matter accumulation was limited by source in some cultivars, in other cultivars, it was limited by sink. Grain N accumulation was mainly limited by source supply. The contribution of pre-anthesis dry mass to grain yield from high to low was stem, leaf and chaff, while the contribution of pre-anthesis N to grain N from high to low was leaf, stem and chaff. Cultivars S7221 and TA9818 can increase the contribution of remobilization of DM and N to grain at the maximum ratio under reducing source treatments, which may be the major reason for these cultivars having lower decrease in grain yield and N content under reducing source treatments.

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Section: Resultsmentioning

confidence: 99%

Effect of Source-Sink Manipulation on Photosynthetic Characteristics of Flag Leaf and the Remobilization of Dry Mass and Nitrogen in Vegetative Organs of Wheat

Zhang

Sun

Hong

et al. 2014

Journal of Integrative Agriculture

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“…Although high temperatures during this period produced high grain growth rates, they also induced to a shorter duration of grain filling period which finally determined a lower final grain weight (WARRINGTON et al 1977, BRUCKNER and FROHBERG 1987, GON-ZALEZ MoNTANER 1987. Other authors (GRABAU et al 1990, MA et al 1990) have reported that reducing the number of grains withm a spike, some cultivars produced partial compensatory increases in individual grain weight but some others did not. This genotypic variation could be related to the cultivar potential for formating A starch granules during the first period of grain filling (MARTINEZ-CARRASCO et al 1988).…”

Section: Introductionmentioning

confidence: 93%

“…However, it has been rencently reported that in some modern cultivars wheat yield might be source limited in some post-anthesis environments (see MARTINEZ-GARRASCO et al 1988, GRABAU et al 1990, MA et al 1990). SLAFER and MlRALLES Therefore, the analysis of the fate of the plant green tissues after anthesis acquires more interest.…”

Section: Introductionmentioning

confidence: 99%

Green Area Duration during the Grain Filling Period of an Argentine Wheat Cultivar as Influenced by Sowing Date, Temperature and Sink Strength

Slafer

Miralles

1992

J Agronomy Crop Science

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The effects of sowing date, air temperature during the grain filling period, sink‐strength, and then‐interactions on the wheat green area (leaves, leaf sheaths and peduncles) duration from anthesis to total senescence were determined under field conditions at Buenos Aires (Argentina). The individual grain weight was determined as an average of either all grains or basal grains of the spikelets 7 and 8 through the treatments. The delayed sowing date reduced the period of leaf senescence when it was regarded as calendar time between anthesis to maturity, but it did not affect that period regarded as thermal time. Similarly, the increased temperature has also increased the rate of senescence. On the other hand, the sink strength did not affect the green area duration; since neither the rate nor the period of senescence was altered. Similarly, both sowing date and mean temperature decreased the individual grain weight, but the sink strength did not affected the weight of the basal grains, which could be interpreted as the effects of the other two factors were independent to the availability of assimilates per grain. The effect of increased grain filling temperature on reducing grain weight did not operate via reducing the availability of assimilates although it also reduced the total grain area duration. We observed that the increased temperature decreased the individual grain weight of the basal grains at any source sink ratio.

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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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Sink Manipulation in Wheat: Compensatory Changes in Kernel Size

Cited by 47 publications

References 0 publications

Effect of Source-Sink Manipulation on Photosynthetic Characteristics of Flag Leaf and the Remobilization of Dry Mass and Nitrogen in Vegetative Organs of Wheat

Effect of Source-Sink Manipulation on Photosynthetic Characteristics of Flag Leaf and the Remobilization of Dry Mass and Nitrogen in Vegetative Organs of Wheat

Green Area Duration during the Grain Filling Period of an Argentine Wheat Cultivar as Influenced by Sowing Date, Temperature and Sink Strength

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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