Introduction:
The Green Revolution, which took place from the 1940s to the 1970s, was a period of significant agricultural advancements that resulted in increased crop yields and improved food production. Plant breeding techniques played a crucial role in the development of high-yielding and disease-resistant crop varieties during this revolution.

Explanation:
1. High-yielding varieties:
Plant breeding techniques were used to develop high-yielding crop varieties during the Green Revolution. Traditional breeding methods such as selection, hybridization, and backcrossing were employed to combine desirable traits from different varieties. The aim was to develop plants that produced more grains, resulting in higher crop yields. These high-yielding varieties played a pivotal role in increasing agricultural productivity and addressing food scarcity.

2. Disease resistance:
Another critical aspect of the Green Revolution was the development of disease-resistant crop varieties. Plant breeding techniques allowed scientists to identify and incorporate genes for disease resistance into crop plants. By selectively breeding plants with resistance to specific diseases, breeders were able to develop varieties that were more resilient to various pathogens. This reduced the impact of diseases on crop yields and helped ensure a stable food supply.

3. Integration of traits:
Plant breeding techniques also facilitated the integration of multiple traits into crop varieties. For example, breeders aimed to develop varieties with both high-yielding potential and disease resistance. By carefully selecting and crossing parent plants with these desired traits, breeders were able to create new varieties that combined both characteristics. This integration of traits was essential for maximizing crop productivity while minimizing losses due to diseases.

4. Importance of plant breeding:
The Green Revolution was highly dependent on plant breeding techniques because they allowed scientists to manipulate the genetic makeup of crop plants. By selectively breeding plants with desirable traits, breeders were able to create improved varieties that exhibited increased yields and resistance to diseases. Without plant breeding, it would have been challenging to achieve the significant advancements in agricultural productivity that occurred during this period.

Conclusion:
Plant breeding techniques were instrumental in the success of the Green Revolution. They enabled the development of high-yielding and disease-resistant crop varieties, which played a vital role in increasing agricultural productivity and addressing food scarcity. The integration of traits through plant breeding allowed for the creation of improved varieties that exhibited multiple desirable characteristics. Overall, plant breeding techniques were essential for the development and implementation of the Green Revolution.