Pieris japonica Cultivar Greprs Propagation and Disease Resistance

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Solution Overview

Problem

Pieris japonica cultivars typically face challenges in propagation, heat tolerance, and disease resistance, especially in hot and humid climates, with low rooting rates and susceptibility to root rot and leaf spot.

Innovation Solution

The cultivar 'Greprs' exhibits enhanced propagation success, heat tolerance, and disease resistance, characterized by high rooting rates, dense foliage, and resistance to root rot and leaf spot, with white flowers emerging from white buds, distinguishing it from other Pieris cultivars like 'Temple Bells' and 'Mountain Snow'.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If Pieris japonica cuttings are taken from plants grown in hot climates, then the plants can be propagated in southern regions, but the rooting rates are typically low

Engineering Contradiction:

Improverooting rateVSAvoidhot climate

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The cultivar 'Greprs' exhibits altered physiological parameters that enable successful propagation in hot climates where conventional Pieris japonica fail. The plant demonstrates modified rooting characteristics and heat tolerance parameters that allow cuttings to achieve 85-90% rooting rates despite high temperature stress, representing a fundamental parameter change in the species' environmental response

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If Pieris japonica is grown in hot and humid climates, then landscape use in southern regions is possible, but the plants are susceptible to root rot and leaf spot

Engineering Contradiction:

Improveheat toleranceVSAvoiddisease susceptibility

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The cultivar 'Greprs' converts the harmful effect of hot humid conditions into a beneficial trait by developing natural resistance to root rot and leaf spot diseases. The plant's physiological adaptations to heat stress simultaneously provide disease resistance, transforming an environment that would normally cause harm into one where the plant thrives with enhanced disease immunity

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Productivity

If conventional Pieris japonica cultivars are propagated in southern regions, then landscape establishment is attempted, but propagation success is low

Engineering Contradiction:

Improvepropagation successVSAvoidhot climate

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The cultivar 'Greprs' represents a fundamental parameter change in propagation biology, achieving 85-90% rooting rates in hot climates compared to the typical low success rates of conventional cultivars. This parameter change in rooting efficiency and heat tolerance enables productive propagation in previously unsuitable conditions

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUSPP23584P2Pieris plant named `Greprs`

Publication Date: 2013.05.07 GREENLEAF NURSERY

AI summary

A new cultivar of Pieris japonica named ‘Greprs’ that is characterized by its high rate of propagation success and its healthy foliage and a vigorous growth habit in the southern regions of the U.S., its dense foliage with new spring foliage that emerges green in color with a light pink blush under cool temperatures in containers, its high degree of resistance to root rot and leaf spot, and its white flowers that emerge from white flower buds.