Dry matter and water dynamics of wheat grains in response to source reduction at different phases of grain filling

Agreement that wheat (Triticum aestivum L.) is scarcely limited by source of assimilates during grain fill has not been confirmed when source was drastically decrease in high yield potential environments. Dry matter (DM) and water dynamics of growing grains being possibly able to explain grain weigh...

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Autores principales:	Harcha,Claudia I, Calderini,Daniel F
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2014
Materias:	Grain filling grain water content grain weight shading source-sink ratio Triticum aestivum
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392014000400002
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spelling	oai:scielo:S0718-583920140004000022018-10-01Dry matter and water dynamics of wheat grains in response to source reduction at different phases of grain fillingHarcha,Claudia ICalderini,Daniel F Grain filling grain water content grain weight shading source-sink ratio Triticum aestivum Agreement that wheat (Triticum aestivum L.) is scarcely limited by source of assimilates during grain fill has not been confirmed when source was drastically decrease in high yield potential environments. Dry matter (DM) and water dynamics of growing grains being possibly able to explain grain weight (GW) responses to source-sink ratios (S-Sratios) in these conditions. Objectives were to evaluate response of GW to S-Sratios at different phases during grain fill, and relationship between DM and grain water content in response to different S-Sratios. Wheat was sown at field conditions during 20042005 and 2005-2006 growing seasons. Four S-Sratios were assessed: Control without S-Sratios modification (C), S-Sratios from anthesis (At) +12 d to physiological maturity (ShAll), S-Sratios from At +12 d to first half of grain fill (Sh1st) and from second half of grain fill to maturity (Sh2nd). Thousand grain weight (TGW), GW at individual positions (IGW), stabilized grain water content (SGWC) and grain filling rate (GFR) were measured. TGW sensitivity to S-Sratios varied according to length of treatment and its timing, i.e. ShAll, Sh1st, and Sh2nd treatments reduced TGW by 48%, 26%, and 22%, respectively. These reductions were little higher when IGW were evaluated in ShAll (i.e. 53%) and Sh1st (i.e. 33%) treatments and lower in Sh2nd (i.e. 12%). SGWC sensitivity was lower than that of IGW across S-Sratios (e.g. SIiau 27%, Shust 22%, and Sh2nd 5%). However, close association between IGW and SGWC (R² = 0.78, p < 0.001) and between GFR and SGWC (R² = 0.98, p ≤ 0.001) was found regardless of S-Sratios and seasonsinfo:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.74 n.4 20142014-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392014000400002en10.4067/S0718-58392014000400002
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Grain filling grain water content grain weight shading source-sink ratio Triticum aestivum
spellingShingle	Grain filling grain water content grain weight shading source-sink ratio Triticum aestivum Harcha,Claudia I Calderini,Daniel F Dry matter and water dynamics of wheat grains in response to source reduction at different phases of grain filling
description	Agreement that wheat (Triticum aestivum L.) is scarcely limited by source of assimilates during grain fill has not been confirmed when source was drastically decrease in high yield potential environments. Dry matter (DM) and water dynamics of growing grains being possibly able to explain grain weight (GW) responses to source-sink ratios (S-Sratios) in these conditions. Objectives were to evaluate response of GW to S-Sratios at different phases during grain fill, and relationship between DM and grain water content in response to different S-Sratios. Wheat was sown at field conditions during 20042005 and 2005-2006 growing seasons. Four S-Sratios were assessed: Control without S-Sratios modification (C), S-Sratios from anthesis (At) +12 d to physiological maturity (ShAll), S-Sratios from At +12 d to first half of grain fill (Sh1st) and from second half of grain fill to maturity (Sh2nd). Thousand grain weight (TGW), GW at individual positions (IGW), stabilized grain water content (SGWC) and grain filling rate (GFR) were measured. TGW sensitivity to S-Sratios varied according to length of treatment and its timing, i.e. ShAll, Sh1st, and Sh2nd treatments reduced TGW by 48%, 26%, and 22%, respectively. These reductions were little higher when IGW were evaluated in ShAll (i.e. 53%) and Sh1st (i.e. 33%) treatments and lower in Sh2nd (i.e. 12%). SGWC sensitivity was lower than that of IGW across S-Sratios (e.g. SIiau 27%, Shust 22%, and Sh2nd 5%). However, close association between IGW and SGWC (R² = 0.78, p < 0.001) and between GFR and SGWC (R² = 0.98, p ≤ 0.001) was found regardless of S-Sratios and seasons
author	Harcha,Claudia I Calderini,Daniel F
author_facet	Harcha,Claudia I Calderini,Daniel F
author_sort	Harcha,Claudia I
title	Dry matter and water dynamics of wheat grains in response to source reduction at different phases of grain filling
title_short	Dry matter and water dynamics of wheat grains in response to source reduction at different phases of grain filling
title_full	Dry matter and water dynamics of wheat grains in response to source reduction at different phases of grain filling
title_fullStr	Dry matter and water dynamics of wheat grains in response to source reduction at different phases of grain filling
title_full_unstemmed	Dry matter and water dynamics of wheat grains in response to source reduction at different phases of grain filling
title_sort	dry matter and water dynamics of wheat grains in response to source reduction at different phases of grain filling
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392014000400002
work_keys_str_mv	AT harchaclaudiai drymatterandwaterdynamicsofwheatgrainsinresponsetosourcereductionatdifferentphasesofgrainfilling AT calderinidanielf drymatterandwaterdynamicsofwheatgrainsinresponsetosourcereductionatdifferentphasesofgrainfilling
_version_	1714205339199471616

Dry matter and water dynamics of wheat grains in response to source reduction at different phases of grain filling

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