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首页> 外文期刊>Acta Horticulturae >Influence of rootstock on the response of 'Hass' avocado trees to flooding stress.
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Influence of rootstock on the response of 'Hass' avocado trees to flooding stress.

机译：砧木对'Hass'鳄梨树对洪水胁迫的响应的影响。

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In Chile, commercial avocado production has expanded to areas with poorly-drained soils that are low in oxygen. In these soils, improper irrigation design or management can limit fruit production and quality due to flooding of the root zone. The effects of soil flooding on stomatal conductance, transpiration, leaf chlorophyll content (estimated with a SPAD meter) and vegetative growth of one-year-old 'Hass' avocado trees (Persea americana Mill.) grafted onto one of three different seedling rootstocks were studied in a greenhouse. Trees grafted onto Mexicola, Zutano or Nabal rootstock were subjected to one of two flooding treatments: (1) non-flooded (control) or (2) flooded for six days. After the flooding period, flooded plants were removed from the flood water, placed in the same conditions as the control plants and their responses were measured during a six-day recovery period. Visible symptoms of flooding were desiccation of the shoot apex and leaf abscission. There were no consistent differences between rootstocks for stomatal conductance or transpiration during the flooding period. However, during the recovery period, trees on Mexicola rootstock had higher stomatal conductance and transpiration and appeared more vigorous than trees on the other rootstocks. Root, leaf and total plant dry weights and leaf chlorophyll content were significantly lower for flooded than nonflooded trees. The data indicated that 'Hass' avocado grafted onto Mexicola rootstock are able to recover from six days of soil flooding better than trees grafted onto Zutano or Nabal rootstocks.
机译：在智利，鳄梨的商业化生产已扩大到土壤排水少，氧含量低的地区。在这些土壤中，由于根部区域洪水泛滥，灌溉设计或管理不当会限制果实的产量和品质。土壤淹水对嫁接在其上的一岁“ Hass”鳄梨树（ Persea americana Mill。）气孔导度，蒸腾作用，叶片叶绿素含量（通过SPAD计估计）和营养生长的影响在温室中研究了三种不同的幼苗砧木之一。对嫁接到Mexicola，Zutano或Nabal砧木上的树木进行以下两种淹水处理之一：（1）不淹水（对照）或（2）淹水六天。淹水期过后，将被淹植物从洪水中移出，置于与对照植物相同的条件下，并在六天的恢复期内测量其响应。淹水的明显症状是茎尖干燥和叶片脱落。在淹水期，气孔导度或蒸腾量的砧木之间没有一致的差异。然而，在恢复期内，墨西哥墨西哥砧木上的树木比其他砧木上的气孔导度和蒸腾作用更高，并且看起来更有活力。淹水的树的根，叶和总植物干重以及叶绿素含量显着低于未淹水的树。数据表明，嫁接到Mexicola砧木上的'Hass'鳄梨比嫁接到Zutano或Nabal砧木上的树能够更好地从土壤淹没的六天中恢复过来。

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