The objective of this work was to study the morphological and physiological characteristics of the wheat flag leaf as affected by increasing sowing densities and plant growth regulators application. The experimental design was a split-plot with completely randomized blocks and four replications. Plots were consisted by four sowing densities (30, 50 70 and 90 plants m-1) and the split-plots by plant growth regulators: a product composed by auxin+gebberellin+cytokinin (Ax+GA+CK), Trinexapac-Ethyl e (Ax+GA+CK) + Trinexapac-Ethyl, and a control without application. Dry mass accumulation, plant height, morphological characteristics, SPAD index, nitrogen and photosynthetic pigments contents in the flag leaf were determined. The increase in the sowing density resulted in lower dry mass accumulation and SPAD index of the flag leaves. Trinexapac-Ethyl caused increase in the SPAD index, but the chlorophyll content of the flag leaf was reduced. The SPAD index values were more correlated with the nitrogen than the chlorophyll contents. Ax+GA+CK did not affect flag leaf characteristics in wheat plants.
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机译：这项工作的目的是研究受播种密度增加和植物生长调节剂应用影响的小麦旗叶的形态和生理特性。实验设计是具有完全随机区组和四个重复的分裂图。地块由四种播种密度（30、50、70和90株植物m-1）组成，植物生长调节剂的分裂图由生长素+赤霉素+细胞分裂素（Ax + GA + CK），Trinexapac-Ethyl e组成（Ax + GA + CK）+ Trinexapac-Ethyl，以及未施药的对照。测定了旗叶的干物质积累，株高，形态特征，SPAD指数，氮和光合色素含量。播种密度的增加导致旗叶的干物质积累和SPAD指数降低。 Trinexapac-Ethyl导致SPAD指数增加，但旗叶的叶绿素含量降低。与叶绿素含量相比，SPAD指数值与氮的相关性更高。 Ax + GA + CK不会影响小麦植株的旗叶特性。
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