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首页> 外文期刊>Chilean Journal of Agricultural Research >Dry matter and water dynamics of wheat grains in response to source reduction at different phases of grain filling
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Dry matter and water dynamics of wheat grains in response to source reduction at different phases of grain filling

机译：灌浆期不同阶段小麦源源还原对小麦籽粒干物质和水分动态的影响

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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 2004-2005 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. ShAll 27%, Sh1st 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.
机译：当小麦在高产潜力环境中急剧减少时，尚未确认小麦（Triticum aestivum L.）在灌浆过程中几乎不受同化物来源的限制。在这些条件下，生长谷物的干物质（DM）和水动力学可能可以解释谷物重量（GW）对源-库比（S-S ratios ）的响应。目的是评估灌浆过程中不同时期GW对S-S ratios 的响应，以及不同的S-S ratios 对DM与谷物含水量的关系。在2004-2005年和2005-2006年生长季节，在田间条件下播种小麦。评估了四个SS ratios ：对照，未进行SS ratios 修饰（C），SS ratios 从花期（At）+12 d到生理成熟（ Sh All ），SS ratios 从At +12 d到籽粒填充的前一半（Sh 1st ），以及从籽粒填充的后一半到成熟度（Sh 2nd ）。测量千粒重（TGW），各个位置的毛重（IGW），稳定的谷物含水量（SGWC）和谷物填充率（GFR）。 TGW对SS ratios 的敏感性随治疗时间及其时机而异，即Sh All ，Sh 1st 和Sh 2nd <治疗使TGW分别降低了48％，26％和22％。当在Sh All （53％）和Sh 1st （即33％）处理中评估IGW时，这些减少量稍高，而Sh 2nd 则较低。子>（即12％）。 SS ratios 的SGWC敏感性低于IGW（例如Sh All 27％，Sh 1st 22％和Sh 2nd 5％）。然而，无论如何，IGW与SGWC之间的紧密关联（R 2 = 0.78，p≤0.001）和GFR与SGWC之间的紧密关联（R 2 = 0.98，p≤0.001）均被发现SS ratios 的数量和季节。

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