JP4392851B2 - How to ripen pear trees - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for ripening fruit on a tree by treating a plant hormone agent, synthetic auxin with pear fruit, so that the pear fruit can be eaten immediately after harvesting from the tree like Japanese pear. It is intended to do.
[0002]
[Prior art]
Pear fruits do not soften until they reach an edible state, even if they are left on the tree for a long time. For this reason, the fruit is harvested during the development of the fruit, softened and reaches an edible state only after ripening for a certain period at room temperature or after low temperature treatment at room temperature.
[0003]
[Problems to be solved by the invention]
Since pear fruits cannot be edible immediately after harvesting from trees like Japanese pear fruits, ripening is performed indoors after harvesting, but when ripening at room temperature, the number of days to soften until edible The problem is that it varies depending on the fruit. On the other hand, when the fruit is stored for a certain period of time at a low temperature of around 4 ° C. and then ripened at room temperature, the maturity of each individual fruit will be equal, but there will be facility costs such as the introduction of a low temperature storage and its operation, The problem is that much labor is required for carrying in and out of the low temperature storage. In the present invention, in order to be able to eat pear fruit immediately after harvesting without performing indoor ripening treatment after harvesting, a method for ripening pear fruit on a tree using a plant hormone agent was examined. Is.
[0004]
[Means for Solving the Problems]
When pear fruits soften, the generation of ethylene as a plant hormone substance becomes vigorous. Therefore, the softening of the fruit can be promoted by artificially increasing the endogenous ethylene concentration of the fruit. As a means for increasing the endogenous ethylene concentration, when a plant hormone agent, a synthetic auxin agent, or 2,4-dichlorophenoxy-propionic acid (2,4-DP) is treated on the fruit after 140 days in full bloom, The ethylene concentration gradually increases, the softening progresses on the tree, and it reaches an edible state on the tree approximately 50 days after the treatment. The concentration of the treatment liquid is appropriate from 45 ppm to 90 ppm from the viewpoint of economy and effect. Therefore, the present invention has made it possible to ripen pears on the tree by spraying a plant hormone agent and synthetic auxin having a concentration of 45 ppm to 90 ppm over the whole tree mainly with fruits.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.
[0006]
[Example 1]
In Example 1, pear variety La France (10th grade, Quince C rootstock) was used as a test material. The synthetic auxin 2,4-DP 90 ppm solution was sprayed over the whole tree on the 143, 151, and 159 days after full bloom. Thereafter, the endogenous ethylene concentration, the fruit hardness, and the sugar content of the fruit were measured in each treatment section. The indoor ripening zone is a treatment zone in which the fruit was ripened in a room at 20 ° C. and 90% RH after harvesting the fruit on the 165th day after full bloom. FIG. 1 shows the change in fruit hardness. In each 2,4-DP treated group, the fruit hardness decreased compared to the untreated group, and the earlier the 2,4-DP treatment time, the faster the hardness. 2,4-DP; 143 days after full bloom, 193 days after full bloom, 2,4-DP; 151 days after full bloom, and 200 days after full bloom in the treated ripening zone and indoor ripening zone (35 days after ripening) 2,4-DP; 159 days after full bloom In the treated area, 207 days after full bloom, each fruit reached a state where it was edible. FIG. 2 shows the transition of the endogenous ethylene concentration. The earlier the 2,4-DP treatment time, the faster the endogenous ethylene concentration in the fruit increased. The ethylene concentration was higher in any 2,4-DP treated group than in the untreated group. Table 1 shows the sugar content of the fruit. After 165 days after full bloom, there was no significant difference in the sugar content of each section.
[0007]
[Table 1]
[0008]
[Example 2]
In Example 2, pear variety La France (9th grade, Quince C rootstock) was used as a test material. A synthetic auxin 2,4-DP 45 ppm solution was sprayed on the entire tree 159 days after full bloom. The indoor ripening zone was harvested 159 days after full bloom and was then ripened in a room at 20 ° C. and 90% RH. FIG. 3 shows changes in fruit hardness in Example 2. In the indoor ripening zone and the 2,4-DP treated zone, the fruit hardness is lower than in the untreated zone, and in the 2,4-DP treated zone, more than 80% of the fruits are edible bears on the tree 199 days after full bloom. Reached.
[0009]
From the above two examples, the tree ripening method of pear fruit by the synthetic auxin 2,4-DP treatment in the present invention promotes softening of the fruit by increasing the endogenous ethylene concentration of the fruit. This technology is very practical and will lead to increased consumption of pears.
[0010]
【The invention's effect】
The present invention is an unprecedented technique in that pear fruits can be eaten immediately after harvesting from the tree. By introducing the present invention into a tourist orchard, it is considered that the demand for pears is expanded.
[0011]
[Brief description of the drawings]
FIG. 1 is a graph showing the change in fruit hardness with respect to the number of days after full bloom when a synthetic auxin 2,4-DP 90 ppm solution is sprayed.
FIG. 2 is a graph showing changes in endogenous ethylene concentration with respect to the number of days after full bloom.
FIG. 3 is a graph showing changes in fruit hardness with respect to days after full bloom when a synthetic auxin 2,4-DP 45 ppm solution is sprayed.

Claims (1)

The pear is ripened on the tree by spraying a synthetic auxin having a concentration of 45 ppm to 90 ppm on the whole tree mainly composed of fruits within a period of 140 to 159 days after the pear is in full bloom. Ripening method of tree .