The figure illustrates partial rootzone drying (PRD). Select 2 statements that correctly describe PRD.

Question

BlackTom AI · Accepted Answer

Question restatement: The figure illustrates partial rootzone drying (PRD). Select 2 statements that correctly describe PRD.

Option 1: 'PRD is an irrigation technique that uses the ABA response in grapevines and fruit trees to restrict growth and development.' This option attributes PRD primarily to the ABA response driving growth restriction. While ABA is involved in PRD signaling, this statement is overly broad and does not capture the core PRD mechanism of alternating wet/dry root zones to modulate water availability and plant response. It also implies ABA is the sole or primary driver of PRD’s effects, which is an oversimplification. Therefore, this option is not selected as one of the two correct statements.

Option 2: 'The application of PRD is beneficial for short term to control grapevine canopy, but it causes significant yield reductions if applied for a long time.' This claim emphasizes a potential downside of long-term stress. In practice, PRD aims to balance water stress to improve water use efficiency and quality while avoiding chronic stress that would harm yield. Saying it causes significant yield reductions with long-term use is not an accurate or general description of PRD’s typical objective and outcomes, making this option incorrect.

Option 3: 'Switching or alternating the irrigated root zone in PRD is essential to avoid long term ABA induced stomata closure which can lead to irreversible leaf senescence.' This statement highlights a key design feature of PRD: alternating zones to prevent prolonged ABA-triggered stomatal closure and potential damage. By rotating wet and dry zones, plants avoid sustained stress that could damage tissues, aligning with PRD principles. This option is correct.

Option 4: 'PRD improves the water use efficiency and fruit quality of grapevines by controlling excessive vegetative vigour through regulated application of water deficit.' This captures the practical outcomes of PRD: better water use efficiency and improved fruit quality through moderated vegetative growth via controlled water deficit. It reflects the intended benefits of PRD in vineyards. This option is correct.

Option 5: 'By imposing a controlled water stress on grapevines, production of ABA occurs inducing partial stomata closure, and consequently reduce carbon assimilation.' While this statement describes a possible hormonal response to water stress, it frames PRD as a simple direct trigger of ABA and reduced carbon assimilation without mentioning the crucial aspect of root zone alternation and regulated watering pattern. It also emphasizes a broad consequence (carbon assimilation) rather than the management strategy and outcomes emphasized in PRD. Therefore, this option is not considered one of the two correct statements.

Summary of reasoning: The two statements that best describe the PRD concept and its practical outcomes are Option 3 (alternating irrigated root zones to prevent long-term ABA effects) and Option 4 (PRD improving WUE and fruit quality via regulated water deficit). The other options either overgeneralize PRD’s mechanism, misstate its long-term effects, or describe aspects that are not central to the standard PRD description.

The figure illustrates partial rootzone drying (PRD). Select 2 statements that correctly describe PRD.多项选择题

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