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首页> 外文期刊>Acta Horticulturae >Is PCD a reliable indicator of berry quality attributes in water stressed vineyards?
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Is PCD a reliable indicator of berry quality attributes in water stressed vineyards?

机译：PCD是缺水葡萄园中浆果品质属性的可靠指标吗？

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Grape berry composition in terms of sugars and titratable acidity is strongly dependent on vine water status. The objective of this study was to evaluate the feasibility of using airborne derived Plant Cell Density (PCD) and canopy reflectance derived Simple Ratio (SR) measurements - both remote indicators of leaf area and intercepted light - at estimating berry yield and composition in vineyards experiencing water deficits. In addition, the capability of the Water Index (WI) - a hyperspectral reflectance based indicator of water status - derived from canopy reflectance at estimating berry yield and composition was tested. The study was conducted in vineyards of Vitis vinifera L. 'Chardonnay'. Remote optical imagery was acquired at veraison and PCD derived. Field measurements of fractional intercepted Photosynthetic Active Radiation (fIPAR), predawn water potential ( Psi p), canopy to air temperature difference at midday ( Delta Tmidday) and canopy hyperspectral reflectance were also conducted at the stage of veraison. Yield, Total Soluble Solids (TSS), Titratable Acidity (TA) and maturation index (IMAD) were determined at harvest. Predawn water potential ranged from -0.85+or-0.06 MPa to -0.50+or-0.07 MPa among the vineyards studied indicating moderate to severe water stress at the stage of veraison. Berry quality attributes did not show significant relationships against fIPAR but were related to Delta Tmidday in a variable extend. Consistently, PCD derived from airborne imagery, as well as the SR, did not show significant correlation against berry quality attributes. On the other hand, the WI derived from canopy reflectance showed significant correlation against Delta Tmidday (r=-0.82, P<0.05) and successfully estimated TA and IMAD (r=0.70, P<0.05, for both indices). The results obtained suggest that, in vineyards experiencing water deficits, remote estimates of vine water status through the WI might be more appropriate to characterize berry composition than remote estimates of vine vigor such as SR or PCD.
机译：就糖和可滴定的酸度而言，葡萄浆果的成分在很大程度上取决于藤本植物的水分状况。这项研究的目的是评估使用空气传播的植物细胞密度（PCD）和冠层反射率的简单比值（SR）测量（叶面积的远景指标和截获的光）在评估葡萄园中浆果的产量和成分方面的可行性。缺水。此外，测试了水指数（WI）（基于高光谱反射率的水状况指标）从估算树莓产量和组成时的冠层反射率得出的能力。这项研究是在Vitis vinifera L.“霞多丽”的葡萄园中进行的。远程光学成像是通过检验获得的，并通过PCD得出。截获的部分光合有效辐射（fIPAR），黎明前的水势（Psi p ），中午的冠层与气温差（Delta T midday ）和冠层高光谱反射率的现场测量在验证阶段也进行了。在收获时确定产量，总可溶性固形物（TSS），可滴定酸度（TA）和成熟指数（IMAD）。在所研究的葡萄园中，黎明前的水势范围为-0.85+或-0.06 MPa至-0.50+或-0.07 MPa，表明在阶段性干旱胁迫期间中度至重度。浆果品质属性与fIPAR的关系不显着，但与Delta T midday 有一定的相关性。一致地，源自机载图像的PCD以及SR并未显示出与浆果质量属性的显着相关性。另一方面，来自冠层反射率的WI与Delta T 正午呈显着相关性（r = -0.82，P <0.05），并成功估算了TA和IMAD（r = 0.70，P <0.05，对于两个索引）。获得的结果表明，在出现缺水的葡萄园中，通过WI对葡萄水分状况的远程估计可能比对SR或PCD等葡萄活力的远程估计更适合表征浆果成分。

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